161172969 has 16 divisors (see below), whose sum is σ = 219761472. Its totient is φ = 105043968.

The previous prime is 161172967. The next prime is 161172997. The reversal of 161172969 is 969271161.

161172969 = T₂₄₇ + T₂₄₈ + ... + T₉₉₃.

It is not a de Polignac number, because 161172969 - 2¹ = 161172967 is a prime.

It is a super-2 number, since 2×161172969² = 51953451872549922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 161172969.

It is not an unprimeable number, because it can be changed into a prime (161172961) 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, 20817 + ... + 27489.

It is an arithmetic number, because the mean of its divisors is an integer number (13735092).

Almost surely, 2^161172969 is an apocalyptic number.

It is an amenable number.

161172969 is a deficient number, since it is larger than the sum of its proper divisors (58588503).

161172969 is an equidigital number, since it uses as much as digits as its factorization.

161172969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6856.

The product of its digits is 40824, while the sum is 42.

The square root of 161172969 is about 12695.3916442148. The cubic root of 161172969 is about 544.2069311249.

The spelling of 161172969 in words is "one hundred sixty-one million, one hundred seventy-two thousand, nine hundred sixty-nine".