1161157056531 has 32 divisors (see below), whose sum is σ = 1574322677760. Its totient is φ = 761133469824.

The previous prime is 1161157056509. The next prime is 1161157056569. The reversal of 1161157056531 is 1356507511611.

It is not a de Polignac number, because 1161157056531 - 2³⁰ = 1160083314707 is a prime.

It is a super-2 number, since 2×1161157056531² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1161157058531) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 107142045 + ... + 107152881.

It is an arithmetic number, because the mean of its divisors is an integer number (49197583680).

Almost surely, 2^{1161157056531} is an apocalyptic number.

1161157056531 is a deficient number, since it is larger than the sum of its proper divisors (413165621229).

1161157056531 is a wasteful number, since it uses less digits than its factorization.

1161157056531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12755.

The product of its (nonzero) digits is 94500, while the sum is 42.

The spelling of 1161157056531 in words is "one trillion, one hundred sixty-one billion, one hundred fifty-seven million, fifty-six thousand, five hundred thirty-one".