320472539 has 2 divisors, whose sum is σ = 320472540. Its totient is φ = 320472538.

The previous prime is 320472527. The next prime is 320472541. The reversal of 320472539 is 935274023.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 320472539 - 2²⁰ = 319423963 is a prime.

It is a Sophie Germain prime.

Together with 320472541, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p_17299304 and since 320472539 and 17299304 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 320472499 and 320472508.

It is not a weakly prime, because it can be changed into another prime (320472239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160236269 + 160236270.

It is an arithmetic number, because the mean of its divisors is an integer number (160236270).

Almost surely, 2^320472539 is an apocalyptic number.

320472539 is a deficient number, since it is larger than the sum of its proper divisors (1).

320472539 is an equidigital number, since it uses as much as digits as its factorization.

320472539 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 45360, while the sum is 35.

The square root of 320472539 is about 17901.7468142078. The cubic root of 320472539 is about 684.3268923851.

The spelling of 320472539 in words is "three hundred twenty million, four hundred seventy-two thousand, five hundred thirty-nine".