31980393031 has 2 divisors, whose sum is σ = 31980393032. Its totient is φ = 31980393030.

The previous prime is 31980393023. The next prime is 31980393037. The reversal of 31980393031 is 13039308913.

It is a strong prime.

It is an emirp because it is prime and its reverse (13039308913) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31980393031 - 2³ = 31980393023 is a prime.

It is a super-2 number, since 2×31980393031² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31980393037) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15990196515 + 15990196516.

It is an arithmetic number, because the mean of its divisors is an integer number (15990196516).

Almost surely, 2^31980393031 is an apocalyptic number.

31980393031 is a deficient number, since it is larger than the sum of its proper divisors (1).

31980393031 is an equidigital number, since it uses as much as digits as its factorization.

31980393031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 52488, while the sum is 40.

The spelling of 31980393031 in words is "thirty-one billion, nine hundred eighty million, three hundred ninety-three thousand, thirty-one".