166928431 has 2 divisors, whose sum is σ = 166928432. Its totient is φ = 166928430.

The previous prime is 166928413. The next prime is 166928441. The reversal of 166928431 is 134829661.

166928431 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

Together with previous prime (166928413) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166928431 is a prime.

It is a super-2 number, since 2×166928431² = 55730202152243522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166928401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83464215 + 83464216.

It is an arithmetic number, because the mean of its divisors is an integer number (83464216).

Almost surely, 2^166928431 is an apocalyptic number.

166928431 is a deficient number, since it is larger than the sum of its proper divisors (1).

166928431 is an equidigital number, since it uses as much as digits as its factorization.

166928431 is an evil number, because the sum of its binary digits is even.

The product of its digits is 62208, while the sum is 40.

The square root of 166928431 is about 12920.0785988321. The cubic root of 166928431 is about 550.6091663756.

The spelling of 166928431 in words is "one hundred sixty-six million, nine hundred twenty-eight thousand, four hundred thirty-one".