31379239 has 2 divisors, whose sum is σ = 31379240. Its totient is φ = 31379238.

The previous prime is 31379177. The next prime is 31379261. The reversal of 31379239 is 93297313.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31379239 - 2¹³ = 31371047 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31379198 and 31379207.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31379639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15689619 + 15689620.

It is an arithmetic number, because the mean of its divisors is an integer number (15689620).

Almost surely, 2^31379239 is an apocalyptic number.

31379239 is a deficient number, since it is larger than the sum of its proper divisors (1).

31379239 is an equidigital number, since it uses as much as digits as its factorization.

31379239 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 30618, while the sum is 37.

The square root of 31379239 is about 5601.7175044802. The cubic root of 31379239 is about 315.4138810881.

The spelling of 31379239 in words is "thirty-one million, three hundred seventy-nine thousand, two hundred thirty-nine".