1161322731 has 16 divisors (see below), whose sum is σ = 1811030400. Its totient is φ = 733466664.

The previous prime is 1161322709. The next prime is 1161322753. The reversal of 1161322731 is 1372231611.

1161322731 is a `hidden beast` number, since 11 + 613 + 2 + 2 + 7 + 31 = 666.

It is an interprime number because it is at equal distance from previous prime (1161322709) and next prime (1161322753).

It is not a de Polignac number, because 1161322731 - 2⁶ = 1161322667 is a prime.

It is a super-2 number, since 2×1161322731² = 2697340971074596722, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 1161322695 and 1161322704.

It is not an unprimeable number, because it can be changed into a prime (1161322231) 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, 1131381 + ... + 1132406.

It is an arithmetic number, because the mean of its divisors is an integer number (113189400).

Almost surely, 2^1161322731 is an apocalyptic number.

1161322731 is a deficient number, since it is larger than the sum of its proper divisors (649707669).

1161322731 is a wasteful number, since it uses less digits than its factorization.

1161322731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2263815 (or 2263809 counting only the distinct ones).

The product of its digits is 1512, while the sum is 27.

The square root of 1161322731 is about 34078.1855590934. The cubic root of 1161322731 is about 1051.1167954123.

The spelling of 1161322731 in words is "one billion, one hundred sixty-one million, three hundred twenty-two thousand, seven hundred thirty-one".