31801200979 has 2 divisors, whose sum is σ = 31801200980. Its totient is φ = 31801200978.

The previous prime is 31801200947. The next prime is 31801201049. The reversal of 31801200979 is 97900210813.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31801200979 - 2⁵ = 31801200947 is a prime.

It is a super-2 number, since 2×31801200979² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (31801200479) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15900600489 + 15900600490.

It is an arithmetic number, because the mean of its divisors is an integer number (15900600490).

Almost surely, 2^31801200979 is an apocalyptic number.

31801200979 is a deficient number, since it is larger than the sum of its proper divisors (1).

31801200979 is an equidigital number, since it uses as much as digits as its factorization.

31801200979 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27216, while the sum is 40.

The spelling of 31801200979 in words is "thirty-one billion, eight hundred one million, two hundred thousand, nine hundred seventy-nine".