31425539 has 2 divisors, whose sum is σ = 31425540. Its totient is φ = 31425538.

The previous prime is 31425529. The next prime is 31425547. The reversal of 31425539 is 93552413.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31425539 is a prime.

It is equal to p_1940576 and since 31425539 and 1940576 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (31425509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15712769 + 15712770.

It is an arithmetic number, because the mean of its divisors is an integer number (15712770).

Almost surely, 2^31425539 is an apocalyptic number.

31425539 is a deficient number, since it is larger than the sum of its proper divisors (1).

31425539 is an equidigital number, since it uses as much as digits as its factorization.

31425539 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16200, while the sum is 32.

The square root of 31425539 is about 5605.8486422664. The cubic root of 31425539 is about 315.5689356878.

The spelling of 31425539 in words is "thirty-one million, four hundred twenty-five thousand, five hundred thirty-nine".