121142645 has 16 divisors (see below), whose sum is σ = 159125232. Its totient is φ = 87989760.

The previous prime is 121142627. The next prime is 121142677. The reversal of 121142645 is 546241121.

It can be written as a sum of positive squares in 8 ways, for example, as 54671236 + 66471409 = 7394^2 + 8153^2 .

It is a de Polignac number, because none of the positive numbers 2^k-121142645 is a prime.

It is a super-3 number, since 3×121142645³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11312 + ... + 19241.

It is an arithmetic number, because the mean of its divisors is an integer number (9945327).

Almost surely, 2^121142645 is an apocalyptic number.

It is an amenable number.

121142645 is a deficient number, since it is larger than the sum of its proper divisors (37982587).

121142645 is a wasteful number, since it uses less digits than its factorization.

121142645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30632.

The product of its digits is 1920, while the sum is 26.

The square root of 121142645 is about 11006.4819538307. The cubic root of 121142645 is about 494.8030301587.

Adding to 121142645 its reverse (546241121), we get a palindrome (667383766).

The spelling of 121142645 in words is "one hundred twenty-one million, one hundred forty-two thousand, six hundred forty-five".