1165890431 has 2 divisors, whose sum is σ = 1165890432. Its totient is φ = 1165890430.

The previous prime is 1165890409. The next prime is 1165890443. The reversal of 1165890431 is 1340985611.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1165890431 - 2⁶ = 1165890367 is a prime.

It is a super-2 number, since 2×1165890431² = 2718600994194731522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1165890491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 582945215 + 582945216.

It is an arithmetic number, because the mean of its divisors is an integer number (582945216).

Almost surely, 2^1165890431 is an apocalyptic number.

1165890431 is a deficient number, since it is larger than the sum of its proper divisors (1).

1165890431 is an equidigital number, since it uses as much as digits as its factorization.

1165890431 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25920, while the sum is 38.

The square root of 1165890431 is about 34145.1377358475. The cubic root of 1165890431 is about 1052.4930724000.

The spelling of 1165890431 in words is "one billion, one hundred sixty-five million, eight hundred ninety thousand, four hundred thirty-one".