161165001 has 16 divisors (see below), whose sum is σ = 224501760. Its totient is φ = 102719760.

The previous prime is 161164987. The next prime is 161165003. The reversal of 161165001 is 100561161.

It is not a de Polignac number, because 161165001 - 2¹⁵ = 161132233 is a prime.

It is not an unprimeable number, because it can be changed into a prime (161165003) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2721 + ... + 18158.

It is an arithmetic number, because the mean of its divisors is an integer number (14031360).

Almost surely, 2^161165001 is an apocalyptic number.

It is an amenable number.

161165001 is a deficient number, since it is larger than the sum of its proper divisors (63336759).

161165001 is a wasteful number, since it uses less digits than its factorization.

161165001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20996.

The product of its (nonzero) digits is 180, while the sum is 21.

The square root of 161165001 is about 12695.0778256772. The cubic root of 161165001 is about 544.1979628876.

The spelling of 161165001 in words is "one hundred sixty-one million, one hundred sixty-five thousand, one".