31528618939 has 2 divisors, whose sum is σ = 31528618940. Its totient is φ = 31528618938.

The previous prime is 31528618921. The next prime is 31528618949. The reversal of 31528618939 is 93981682513.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31528618939 - 2¹⁷ = 31528487867 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31528618939.

It is not a weakly prime, because it can be changed into another prime (31528618949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15764309469 + 15764309470.

It is an arithmetic number, because the mean of its divisors is an integer number (15764309470).

Almost surely, 2^31528618939 is an apocalyptic number.

31528618939 is a deficient number, since it is larger than the sum of its proper divisors (1).

31528618939 is an equidigital number, since it uses as much as digits as its factorization.

31528618939 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2799360, while the sum is 55.

The spelling of 31528618939 in words is "thirty-one billion, five hundred twenty-eight million, six hundred eighteen thousand, nine hundred thirty-nine".