31320539 has 2 divisors, whose sum is σ = 31320540. Its totient is φ = 31320538.

The previous prime is 31320517. The next prime is 31320547. The reversal of 31320539 is 93502313.

It is a strong prime.

It is an emirp because it is prime and its reverse (93502313) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31320539 - 2¹² = 31316443 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (31320599) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15660269 + 15660270.

It is an arithmetic number, because the mean of its divisors is an integer number (15660270).

Almost surely, 2^31320539 is an apocalyptic number.

31320539 is a deficient number, since it is larger than the sum of its proper divisors (1).

31320539 is an equidigital number, since it uses as much as digits as its factorization.

31320539 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2430, while the sum is 26.

The square root of 31320539 is about 5596.4755873675. The cubic root of 31320539 is about 315.2170805664.

The spelling of 31320539 in words is "thirty-one million, three hundred twenty thousand, five hundred thirty-nine".