31096921 has 2 divisors, whose sum is σ = 31096922. Its totient is φ = 31096920.

The previous prime is 31096907. The next prime is 31096931. The reversal of 31096921 is 12969013.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19263321 + 11833600 = 4389^2 + 3440^2 .

It is a cyclic number.

It is not a de Polignac number, because 31096921 - 2²¹ = 28999769 is a prime.

It is not a weakly prime, because it can be changed into another prime (31096931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15548460 + 15548461.

It is an arithmetic number, because the mean of its divisors is an integer number (15548461).

Almost surely, 2^31096921 is an apocalyptic number.

It is an amenable number.

31096921 is a deficient number, since it is larger than the sum of its proper divisors (1).

31096921 is an equidigital number, since it uses as much as digits as its factorization.

31096921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2916, while the sum is 31.

The square root of 31096921 is about 5576.4613331395. The cubic root of 31096921 is about 314.4651071765.

The spelling of 31096921 in words is "thirty-one million, ninety-six thousand, nine hundred twenty-one".