161172100 has 36 divisors (see below), whose sum is σ = 361032448. Its totient is φ = 62388000.

The previous prime is 161172097. The next prime is 161172119. The reversal of 161172100 is 1271161.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 22896 + ... + 29095.

Almost surely, 2^161172100 is an apocalyptic number.

161172100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161172100 is an abundant number, since it is smaller than the sum of its proper divisors (199860348).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161172100 is a wasteful number, since it uses less digits than its factorization.

161172100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52036 (or 52029 counting only the distinct ones).

The product of its (nonzero) digits is 84, while the sum is 19.

The square root of 161172100 is about 12695.3574191513. The cubic root of 161172100 is about 544.2059530521.

The spelling of 161172100 in words is "one hundred sixty-one million, one hundred seventy-two thousand, one hundred".