1156404013 has 4 divisors (see below), whose sum is σ = 1157309440. Its totient is φ = 1155498588.

The previous prime is 1156404001. The next prime is 1156404019. The reversal of 1156404013 is 3104046511.

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 a de Polignac number, because none of the positive numbers 2^k-1156404013 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1156404019) 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, 450795 + ... + 453352.

It is an arithmetic number, because the mean of its divisors is an integer number (289327360).

Almost surely, 2^1156404013 is an apocalyptic number.

It is an amenable number.

1156404013 is a deficient number, since it is larger than the sum of its proper divisors (905427).

1156404013 is an equidigital number, since it uses as much as digits as its factorization.

1156404013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 905426.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 1156404013 is about 34005.9408486223. The cubic root of 1156404013 is about 1049.6307130691.

The spelling of 1156404013 in words is "one billion, one hundred fifty-six million, four hundred four thousand, thirteen".