1161590731 has 16 divisors (see below), whose sum is σ = 1351788480. Its totient is φ = 977518080.

The previous prime is 1161590723. The next prime is 1161590747. The reversal of 1161590731 is 1370951611.

It is not a de Polignac number, because 1161590731 - 2³ = 1161590723 is a prime.

It is a super-2 number, since 2×1161590731² = 2698586052690228722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1161590791) 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, 261255 + ... + 265663.

It is an arithmetic number, because the mean of its divisors is an integer number (84486780).

Almost surely, 2^1161590731 is an apocalyptic number.

1161590731 is a deficient number, since it is larger than the sum of its proper divisors (190197749).

1161590731 is an equidigital number, since it uses as much as digits as its factorization.

1161590731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5094.

The product of its (nonzero) digits is 5670, while the sum is 34.

The square root of 1161590731 is about 34082.1174664955. The cubic root of 1161590731 is about 1051.1976450697.

The spelling of 1161590731 in words is "one billion, one hundred sixty-one million, five hundred ninety thousand, seven hundred thirty-one".