31951379 has 2 divisors, whose sum is σ = 31951380. Its totient is φ = 31951378.

The previous prime is 31951363. The next prime is 31951441. The reversal of 31951379 is 97315913.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31951379 - 2⁴ = 31951363 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (31951319) 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, 15975689 + 15975690.

It is an arithmetic number, because the mean of its divisors is an integer number (15975690).

Almost surely, 2^31951379 is an apocalyptic number.

31951379 is a deficient number, since it is larger than the sum of its proper divisors (1).

31951379 is an equidigital number, since it uses as much as digits as its factorization.

31951379 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 31951379 is about 5652.5550859766. Note that the first 3 decimals coincide. The cubic root of 31951379 is about 317.3193350825.

The spelling of 31951379 in words is "thirty-one million, nine hundred fifty-one thousand, three hundred seventy-nine".