166242631 has 2 divisors, whose sum is σ = 166242632. Its totient is φ = 166242630.

The previous prime is 166242617. The next prime is 166242679. The reversal of 166242631 is 136242661.

166242631 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is an emirp because it is prime and its reverse (136242661) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166242631 is a prime.

It is a super-2 number, since 2×166242631² = 55273224723604322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 166242593 and 166242602.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166245631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83121315 + 83121316.

It is an arithmetic number, because the mean of its divisors is an integer number (83121316).

Almost surely, 2^166242631 is an apocalyptic number.

166242631 is a deficient number, since it is larger than the sum of its proper divisors (1).

166242631 is an equidigital number, since it uses as much as digits as its factorization.

166242631 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10368, while the sum is 31.

The square root of 166242631 is about 12893.5111974978. The cubic root of 166242631 is about 549.8541001432.

The spelling of 166242631 in words is "one hundred sixty-six million, two hundred forty-two thousand, six hundred thirty-one".