165474961 has 2 divisors, whose sum is σ = 165474962. Its totient is φ = 165474960.

The previous prime is 165474929. The next prime is 165474977. The reversal of 165474961 is 169474561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 150798400 + 14676561 = 12280^2 + 3831^2 .

It is an emirp because it is prime and its reverse (169474561) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 165474961 - 2⁵ = 165474929 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is not a weakly prime, because it can be changed into another prime (165474161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82737480 + 82737481.

It is an arithmetic number, because the mean of its divisors is an integer number (82737481).

Almost surely, 2^165474961 is an apocalyptic number.

It is an amenable number.

165474961 is a deficient number, since it is larger than the sum of its proper divisors (1).

165474961 is an equidigital number, since it uses as much as digits as its factorization.

165474961 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 181440, while the sum is 43.

The square root of 165474961 is about 12863.7071250865. The cubic root of 165474961 is about 549.0064276849.

The spelling of 165474961 in words is "one hundred sixty-five million, four hundred seventy-four thousand, nine hundred sixty-one".