31966353431 has 2 divisors, whose sum is σ = 31966353432. Its totient is φ = 31966353430.

The previous prime is 31966353403. The next prime is 31966353443. The reversal of 31966353431 is 13435366913.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31966353431 - 2¹⁴ = 31966337047 is a prime.

It is a super-2 number, since 2×31966353431² (a number of 22 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31966353401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15983176715 + 15983176716.

It is an arithmetic number, because the mean of its divisors is an integer number (15983176716).

Almost surely, 2^31966353431 is an apocalyptic number.

31966353431 is a deficient number, since it is larger than the sum of its proper divisors (1).

31966353431 is an equidigital number, since it uses as much as digits as its factorization.

31966353431 is an evil number, because the sum of its binary digits is even.

The product of its digits is 524880, while the sum is 44.

The spelling of 31966353431 in words is "thirty-one billion, nine hundred sixty-six million, three hundred fifty-three thousand, four hundred thirty-one".