31950091 has 2 divisors, whose sum is σ = 31950092. Its totient is φ = 31950090.

The previous prime is 31950073. The next prime is 31950097. The reversal of 31950091 is 19005913.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31950091 - 2¹¹ = 31948043 is a prime.

It is not a weakly prime, because it can be changed into another prime (31950097) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15975045 + 15975046.

It is an arithmetic number, because the mean of its divisors is an integer number (15975046).

Almost surely, 2^31950091 is an apocalyptic number.

31950091 is a deficient number, since it is larger than the sum of its proper divisors (1).

31950091 is an equidigital number, since it uses as much as digits as its factorization.

31950091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1215, while the sum is 28.

The square root of 31950091 is about 5652.4411540502. The cubic root of 31950091 is about 317.3150711789.

The spelling of 31950091 in words is "thirty-one million, nine hundred fifty thousand, ninety-one".