1161931 has 2 divisors, whose sum is σ = 1161932. Its totient is φ = 1161930.

The previous prime is 1161929. The next prime is 1161947. The reversal of 1161931 is 1391611.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1161931 - 2¹ = 1161929 is a prime.

It is a super-2 number, since 2×1161931² = 2700167297522, which contains 22 as substring.

Together with 1161929, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1161991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 580965 + 580966.

It is an arithmetic number, because the mean of its divisors is an integer number (580966).

2^1161931 is an apocalyptic number.

1161931 is a deficient number, since it is larger than the sum of its proper divisors (1).

1161931 is an equidigital number, since it uses as much as digits as its factorization.

1161931 is an evil number, because the sum of its binary digits is even.

The product of its digits is 162, while the sum is 22.

The square root of 1161931 is about 1077.9290329145. The cubic root of 1161931 is about 105.1300278766.

The spelling of 1161931 in words is "one million, one hundred sixty-one thousand, nine hundred thirty-one".