1213011113 has 4 divisors (see below), whose sum is σ = 1214767248. Its totient is φ = 1211254980.

The previous prime is 1213011097. The next prime is 1213011119. The reversal of 1213011113 is 3111103121.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1213011113 - 2⁴ = 1213011097 is a prime.

It is a super-2 number, since 2×1213011113² = 2942791920522997538, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1213011119) 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, 877031 + ... + 878412.

It is an arithmetic number, because the mean of its divisors is an integer number (303691812).

Almost surely, 2^1213011113 is an apocalyptic number.

It is an amenable number.

1213011113 is a deficient number, since it is larger than the sum of its proper divisors (1756135).

1213011113 is an equidigital number, since it uses as much as digits as its factorization.

1213011113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1756134.

The product of its (nonzero) digits is 18, while the sum is 14.

The square root of 1213011113 is about 34828.3090746594. The cubic root of 1213011113 is about 1066.4854298307.

Adding to 1213011113 its reverse (3111103121), we get a palindrome (4324114234).

The spelling of 1213011113 in words is "one billion, two hundred thirteen million, eleven thousand, one hundred thirteen".