1161532431 has 6 divisors (see below), whose sum is σ = 1677769080. Its totient is φ = 774354948.

The previous prime is 1161532391. The next prime is 1161532439. The reversal of 1161532431 is 1342351611.

It is a happy number.

1161532431 is a `hidden beast` number, since 1 + 1 + 615 + 3 + 2 + 43 + 1 = 666.

It is not a de Polignac number, because 1161532431 - 2¹⁵ = 1161499663 is a prime.

It is a super-2 number, since 2×1161532431² = 2698315176529539522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1161532395 and 1161532404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1161532439) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 64529571 + ... + 64529588.

It is an arithmetic number, because the mean of its divisors is an integer number (279628180).

Almost surely, 2^1161532431 is an apocalyptic number.

1161532431 is a deficient number, since it is larger than the sum of its proper divisors (516236649).

1161532431 is a wasteful number, since it uses less digits than its factorization.

1161532431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129059165 (or 129059162 counting only the distinct ones).

The product of its digits is 2160, while the sum is 27.

The square root of 1161532431 is about 34081.2621685289. The cubic root of 1161532431 is about 1051.1800583109.

The spelling of 1161532431 in words is "one billion, one hundred sixty-one million, five hundred thirty-two thousand, four hundred thirty-one".