161171199 has 24 divisors (see below), whose sum is σ = 267671040. Its totient is φ = 91540368.

The previous prime is 161171177. The next prime is 161171221. The reversal of 161171199 is 991171161.

It is an interprime number because it is at equal distance from previous prime (161171177) and next prime (161171221).

It is not a de Polignac number, because 161171199 - 2⁷ = 161171071 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161171159) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2862 + ... + 18180.

It is an arithmetic number, because the mean of its divisors is an integer number (11152960).

Almost surely, 2^161171199 is an apocalyptic number.

161171199 is a deficient number, since it is larger than the sum of its proper divisors (106499841).

161171199 is a wasteful number, since it uses less digits than its factorization.

161171199 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15499 (or 15496 counting only the distinct ones).

The product of its digits is 3402, while the sum is 36.

The square root of 161171199 is about 12695.3219336888. The cubic root of 161171199 is about 544.2049389591.

It can be divided in two parts, 16 and 1171199, that added together give a triangular number (1171215 = T₁₅₃₀).

The spelling of 161171199 in words is "one hundred sixty-one million, one hundred seventy-one thousand, one hundred ninety-nine".