161172953 has 4 divisors (see below), whose sum is σ = 169655760. Its totient is φ = 152690148.

The previous prime is 161172941. The next prime is 161172961. The reversal of 161172953 is 359271161.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 161172953 - 2¹⁶ = 161107417 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161171953) 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, 4241375 + ... + 4241412.

It is an arithmetic number, because the mean of its divisors is an integer number (42413940).

Almost surely, 2^161172953 is an apocalyptic number.

It is an amenable number.

161172953 is a deficient number, since it is larger than the sum of its proper divisors (8482807).

161172953 is an equidigital number, since it uses as much as digits as its factorization.

161172953 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8482806.

The product of its digits is 11340, while the sum is 35.

The square root of 161172953 is about 12695.3910140649. The cubic root of 161172953 is about 544.2069131166.

The spelling of 161172953 in words is "one hundred sixty-one million, one hundred seventy-two thousand, nine hundred fifty-three".