31431479 has 2 divisors, whose sum is σ = 31431480. Its totient is φ = 31431478.

The previous prime is 31431469. The next prime is 31431481. The reversal of 31431479 is 97413413.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31431479 - 2²⁰ = 30382903 is a prime.

It is a Sophie Germain prime.

Together with 31431481, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p_1940909 and since 31431479 and 1940909 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31431469) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15715739 + 15715740.

It is an arithmetic number, because the mean of its divisors is an integer number (15715740).

Almost surely, 2^31431479 is an apocalyptic number.

31431479 is a deficient number, since it is larger than the sum of its proper divisors (1).

31431479 is an equidigital number, since it uses as much as digits as its factorization.

31431479 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9072, while the sum is 32.

The square root of 31431479 is about 5606.3784210487. The cubic root of 31431479 is about 315.5888171965.

The spelling of 31431479 in words is "thirty-one million, four hundred thirty-one thousand, four hundred seventy-nine".