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121111013 = 779315541
BaseRepresentation
bin1110011100000…
…00000111100101
322102220002002002
413032000013211
5222001023023
620003455045
73000266222
oct716000745
9272802062
10121111013
1162400551
1234687485
131c12582a
1412128949
15a974b28
hex73801e5

121111013 has 4 divisors (see below), whose sum is σ = 121134348. Its totient is φ = 121087680.

The previous prime is 121110991. The next prime is 121111021. The reversal of 121111013 is 310111121.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 108951844 + 12159169 = 10438^2 + 3487^2 .

It is a cyclic number.

It is not a de Polignac number, because 121111013 - 26 = 121110949 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 121110985 and 121111003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121111093) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23 + ... + 15563.

It is an arithmetic number, because the mean of its divisors is an integer number (30283587).

Almost surely, 2121111013 is an apocalyptic number.

It is an amenable number.

121111013 is a deficient number, since it is larger than the sum of its proper divisors (23335).

121111013 is an equidigital number, since it uses as much as digits as its factorization.

121111013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23334.

The product of its (nonzero) digits is 6, while the sum is 11.

The square root of 121111013 is about 11005.0448885954. The cubic root of 121111013 is about 494.7599597989.

Adding to 121111013 its reverse (310111121), we get a palindrome (431222134).

The spelling of 121111013 in words is "one hundred twenty-one million, one hundred eleven thousand, thirteen".

Divisors: 1 7793 15541 121111013