1156561051 has 8 divisors (see below), whose sum is σ = 1264097664. Its totient is φ = 1053413760.

The previous prime is 1156561019. The next prime is 1156561073. The reversal of 1156561051 is 1501656511.

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 1156561051 - 2⁵ = 1156561019 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is not an unprimeable number, because it can be changed into a prime (1156561451) 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, 1096780 + ... + 1097833.

It is an arithmetic number, because the mean of its divisors is an integer number (158012208).

Almost surely, 2^1156561051 is an apocalyptic number.

1156561051 is a deficient number, since it is larger than the sum of its proper divisors (107536613).

1156561051 is a wasteful number, since it uses less digits than its factorization.

1156561051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2194661.

The product of its (nonzero) digits is 4500, while the sum is 31.

The square root of 1156561051 is about 34008.2497491418. The cubic root of 1156561051 is about 1049.6782236984.

The spelling of 1156561051 in words is "one billion, one hundred fifty-six million, five hundred sixty-one thousand, fifty-one".