1162256581 has 16 divisors (see below), whose sum is σ = 1244160000. Its totient is φ = 1082516400.

The previous prime is 1162256573. The next prime is 1162256587. The reversal of 1162256581 is 1856522611.

It is a cyclic number.

It is not a de Polignac number, because 1162256581 - 2³ = 1162256573 is a prime.

It is a super-2 number, since 2×1162256581² = 2701680720155619122, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1162256581.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1162256587) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 580420 + ... + 582418.

It is an arithmetic number, because the mean of its divisors is an integer number (77760000).

Almost surely, 2^1162256581 is an apocalyptic number.

It is an amenable number.

1162256581 is a deficient number, since it is larger than the sum of its proper divisors (81903419).

1162256581 is a wasteful number, since it uses less digits than its factorization.

1162256581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2520.

The product of its digits is 28800, while the sum is 37.

The square root of 1162256581 is about 34091.8843861703. The cubic root of 1162256581 is about 1051.3984634346.

The spelling of 1162256581 in words is "one billion, one hundred sixty-two million, two hundred fifty-six thousand, five hundred eighty-one".