31402979 has 2 divisors, whose sum is σ = 31402980. Its totient is φ = 31402978.

The previous prime is 31402939. The next prime is 31402993. The reversal of 31402979 is 97920413.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31402979 - 2¹² = 31398883 is a prime.

It is a super-2 number, since 2×31402979² = 1972294180148882, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (31402939) 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, 15701489 + 15701490.

It is an arithmetic number, because the mean of its divisors is an integer number (15701490).

Almost surely, 2^31402979 is an apocalyptic number.

31402979 is a deficient number, since it is larger than the sum of its proper divisors (1).

31402979 is an equidigital number, since it uses as much as digits as its factorization.

31402979 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13608, while the sum is 35.

The square root of 31402979 is about 5603.8360968180. The cubic root of 31402979 is about 315.4934032843.

The spelling of 31402979 in words is "thirty-one million, four hundred two thousand, nine hundred seventy-nine".