161072051 has 4 divisors (see below), whose sum is σ = 184082352. Its totient is φ = 138061752.

The previous prime is 161072039. The next prime is 161072071. The reversal of 161072051 is 150270161.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 161072051 - 2²⁶ = 93963187 is a prime.

It is a super-2 number, since 2×161072051² = 51888411226693202, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161072071) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11505140 + ... + 11505153.

It is an arithmetic number, because the mean of its divisors is an integer number (46020588).

Almost surely, 2^161072051 is an apocalyptic number.

161072051 is a deficient number, since it is larger than the sum of its proper divisors (23010301).

161072051 is an equidigital number, since it uses as much as digits as its factorization.

161072051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23010300.

The product of its (nonzero) digits is 420, while the sum is 23.

The square root of 161072051 is about 12691.4164300128. The cubic root of 161072051 is about 544.0933228647.

The spelling of 161072051 in words is "one hundred sixty-one million, seventy-two thousand, fifty-one".