31365091 has 2 divisors, whose sum is σ = 31365092. Its totient is φ = 31365090.

The previous prime is 31365053. The next prime is 31365097. The reversal of 31365091 is 19056313.

It is a strong prime.

It is an emirp because it is prime and its reverse (19056313) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31365091 - 2²¹ = 29267939 is a prime.

It is not a weakly prime, because it can be changed into another prime (31365097) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15682545 + 15682546.

It is an arithmetic number, because the mean of its divisors is an integer number (15682546).

Almost surely, 2^31365091 is an apocalyptic number.

31365091 is a deficient number, since it is larger than the sum of its proper divisors (1).

31365091 is an equidigital number, since it uses as much as digits as its factorization.

31365091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2430, while the sum is 28.

The square root of 31365091 is about 5600.4545351248. The cubic root of 31365091 is about 315.3664702674.

The spelling of 31365091 in words is "thirty-one million, three hundred sixty-five thousand, ninety-one".