31329479 has 2 divisors, whose sum is σ = 31329480. Its totient is φ = 31329478.

The previous prime is 31329469. The next prime is 31329511. The reversal of 31329479 is 97492313.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31329479 is a prime.

It is a super-2 number, since 2×31329479² = 1963072508822882, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31329439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15664739 + 15664740.

It is an arithmetic number, because the mean of its divisors is an integer number (15664740).

Almost surely, 2^31329479 is an apocalyptic number.

31329479 is a deficient number, since it is larger than the sum of its proper divisors (1).

31329479 is an equidigital number, since it uses as much as digits as its factorization.

31329479 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40824, while the sum is 38.

The square root of 31329479 is about 5597.2742473458. The cubic root of 31329479 is about 315.2470691161.

It can be divided in two parts, 313 and 29479, that added together give a palindrome (29792).

The spelling of 31329479 in words is "thirty-one million, three hundred twenty-nine thousand, four hundred seventy-nine".