31972379 has 2 divisors, whose sum is σ = 31972380. Its totient is φ = 31972378.

The previous prime is 31972351. The next prime is 31972387. The reversal of 31972379 is 97327913.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31972379 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (31972319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15986189 + 15986190.

It is an arithmetic number, because the mean of its divisors is an integer number (15986190).

Almost surely, 2^31972379 is an apocalyptic number.

31972379 is a deficient number, since it is larger than the sum of its proper divisors (1).

31972379 is an equidigital number, since it uses as much as digits as its factorization.

31972379 is an evil number, because the sum of its binary digits is even.

The product of its digits is 71442, while the sum is 41.

The square root of 31972379 is about 5654.4123478926. The cubic root of 31972379 is about 317.3888390901.

The spelling of 31972379 in words is "thirty-one million, nine hundred seventy-two thousand, three hundred seventy-nine".