31791953 has 2 divisors, whose sum is σ = 31791954. Its totient is φ = 31791952.

The previous prime is 31791913. The next prime is 31791961. The reversal of 31791953 is 35919713.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31047184 + 744769 = 5572^2 + 863^2 .

It is an emirp because it is prime and its reverse (35919713) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31791953 - 2¹⁰ = 31790929 is a prime.

It is not a weakly prime, because it can be changed into another prime (31791913) 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, 15895976 + 15895977.

It is an arithmetic number, because the mean of its divisors is an integer number (15895977).

Almost surely, 2^31791953 is an apocalyptic number.

It is an amenable number.

31791953 is a deficient number, since it is larger than the sum of its proper divisors (1).

31791953 is an equidigital number, since it uses as much as digits as its factorization.

31791953 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25515, while the sum is 38.

The square root of 31791953 is about 5638.4353326078. The cubic root of 31791953 is about 316.7906846955.

The spelling of 31791953 in words is "thirty-one million, seven hundred ninety-one thousand, nine hundred fifty-three".