1156489013 has 4 divisors (see below), whose sum is σ = 1206771168. Its totient is φ = 1106206860.

The previous prime is 1156488973. The next prime is 1156489021. The reversal of 1156489013 is 3109846511.

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, and also an emirpimes, since its reverse is a distinct semiprime: 3109846511 = 3221 ⋅965491.

It is a cyclic number.

It is not a de Polignac number, because 1156489013 - 2¹⁰ = 1156487989 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 (1156489043) 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, 25141043 + ... + 25141088.

It is an arithmetic number, because the mean of its divisors is an integer number (301692792).

Almost surely, 2^1156489013 is an apocalyptic number.

It is an amenable number.

1156489013 is a deficient number, since it is larger than the sum of its proper divisors (50282155).

1156489013 is an equidigital number, since it uses as much as digits as its factorization.

1156489013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50282154.

The product of its (nonzero) digits is 25920, while the sum is 38.

The square root of 1156489013 is about 34007.1906072819. The cubic root of 1156489013 is about 1049.6564296940.

The spelling of 1156489013 in words is "one billion, one hundred fifty-six million, four hundred eighty-nine thousand, thirteen".