1156020013 has 8 divisors (see below), whose sum is σ = 1163670200. Its totient is φ = 1148387328.

The previous prime is 1156019989. The next prime is 1156020023. The reversal of 1156020013 is 3100206511.

It can be written as a sum of positive squares in 4 ways, for example, as 69856164 + 1086163849 = 8358^2 + 32957^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1156020013 - 2²⁵ = 1122465581 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 (1156020023) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 144523 + ... + 152311.

It is an arithmetic number, because the mean of its divisors is an integer number (145458775).

Almost surely, 2^1156020013 is an apocalyptic number.

It is an amenable number.

1156020013 is a deficient number, since it is larger than the sum of its proper divisors (7650187).

1156020013 is an equidigital number, since it uses as much as digits as its factorization.

1156020013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8751.

The product of its (nonzero) digits is 180, while the sum is 19.

The square root of 1156020013 is about 34000.2943075498. The cubic root of 1156020013 is about 1049.5145187254.

Adding to 1156020013 its reverse (3100206511), we get a palindrome (4256226524).

The spelling of 1156020013 in words is "one billion, one hundred fifty-six million, twenty thousand, thirteen".