166312631 has 2 divisors, whose sum is σ = 166312632. Its totient is φ = 166312630.

The previous prime is 166312607. The next prime is 166312633. The reversal of 166312631 is 136213661.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166312631 is a prime.

It is a super-2 number, since 2×166312631² = 55319782460284322, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 166312633, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 166312594 and 166312603.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166312633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83156315 + 83156316.

It is an arithmetic number, because the mean of its divisors is an integer number (83156316).

Almost surely, 2^166312631 is an apocalyptic number.

166312631 is a deficient number, since it is larger than the sum of its proper divisors (1).

166312631 is an equidigital number, since it uses as much as digits as its factorization.

166312631 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3888, while the sum is 29.

The square root of 166312631 is about 12896.2254555354. The cubic root of 166312631 is about 549.9312652396.

The spelling of 166312631 in words is "one hundred sixty-six million, three hundred twelve thousand, six hundred thirty-one".