2166305431 has 2 divisors, whose sum is σ = 2166305432. Its totient is φ = 2166305430.

The previous prime is 2166305399. The next prime is 2166305447. The reversal of 2166305431 is 1345036612.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2166305431 - 2⁵ = 2166305399 is a prime.

It is a super-2 number, since 2×2166305431² = 9385758440760191522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2166305393 and 2166305402.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2166305231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1083152715 + 1083152716.

It is an arithmetic number, because the mean of its divisors is an integer number (1083152716).

Almost surely, 2^2166305431 is an apocalyptic number.

2166305431 is a deficient number, since it is larger than the sum of its proper divisors (1).

2166305431 is an equidigital number, since it uses as much as digits as its factorization.

2166305431 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12960, while the sum is 31.

The square root of 2166305431 is about 46543.5863573060. The cubic root of 2166305431 is about 1293.9174290195.

The spelling of 2166305431 in words is "two billion, one hundred sixty-six million, three hundred five thousand, four hundred thirty-one".