1161599331 has 32 divisors (see below), whose sum is σ = 1618283520. Its totient is φ = 740563200.

The previous prime is 1161599323. The next prime is 1161599339. The reversal of 1161599331 is 1339951611.

It is an interprime number because it is at equal distance from previous prime (1161599323) and next prime (1161599339).

It is not a de Polignac number, because 1161599331 - 2³ = 1161599323 is a prime.

It is a super-2 number, since 2×1161599331² = 2698626011559295122, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1161599331.

It is not an unprimeable number, because it can be changed into a prime (1161599339) 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, 1680696 + ... + 1681386.

It is an arithmetic number, because the mean of its divisors is an integer number (50571360).

Almost surely, 2^1161599331 is an apocalyptic number.

1161599331 is a deficient number, since it is larger than the sum of its proper divisors (456684189).

1161599331 is a wasteful number, since it uses less digits than its factorization.

1161599331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 987.

The product of its digits is 21870, while the sum is 39.

The square root of 1161599331 is about 34082.2436321320. The cubic root of 1161599331 is about 1051.2002392930.

The spelling of 1161599331 in words is "one billion, one hundred sixty-one million, five hundred ninety-nine thousand, three hundred thirty-one".