165422251 has 2 divisors, whose sum is σ = 165422252. Its totient is φ = 165422250.

The previous prime is 165422203. The next prime is 165422297. The reversal of 165422251 is 152224561.

165422251 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 165422251 - 2⁷ = 165422123 is a prime.

It is a super-2 number, since 2×165422251² = 54729042251814002, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (165432251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82711125 + 82711126.

It is an arithmetic number, because the mean of its divisors is an integer number (82711126).

Almost surely, 2^165422251 is an apocalyptic number.

165422251 is a deficient number, since it is larger than the sum of its proper divisors (1).

165422251 is an equidigital number, since it uses as much as digits as its factorization.

165422251 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4800, while the sum is 28.

The square root of 165422251 is about 12861.6581745901. The cubic root of 165422251 is about 548.9481284276.

The spelling of 165422251 in words is "one hundred sixty-five million, four hundred twenty-two thousand, two hundred fifty-one".