166136431 has 2 divisors, whose sum is σ = 166136432. Its totient is φ = 166136430.

The previous prime is 166136417. The next prime is 166136441. The reversal of 166136431 is 134631661.

It is a strong prime.

It is an emirp because it is prime and its reverse (134631661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 166136431 - 2¹⁹ = 165612143 is a prime.

It is a super-2 number, since 2×166136431² = 55202627410835522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 166136393 and 166136402.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166136441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83068215 + 83068216.

It is an arithmetic number, because the mean of its divisors is an integer number (83068216).

Almost surely, 2^166136431 is an apocalyptic number.

166136431 is a deficient number, since it is larger than the sum of its proper divisors (1).

166136431 is an equidigital number, since it uses as much as digits as its factorization.

166136431 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7776, while the sum is 31.

The square root of 166136431 is about 12889.3921889281. The cubic root of 166136431 is about 549.7369882966.

The spelling of 166136431 in words is "one hundred sixty-six million, one hundred thirty-six thousand, four hundred thirty-one".