161291400 has 48 divisors (see below), whose sum is σ = 500005200. Its totient is φ = 43010880.

The previous prime is 161291371. The next prime is 161291441. The reversal of 161291400 is 4192161.

It is a Harshad number since it is a multiple of its sum of digits (24).

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, 133810 + ... + 135009.

It is an arithmetic number, because the mean of its divisors is an integer number (10416775).

Almost surely, 2^161291400 is an apocalyptic number.

161291400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161291400 is an abundant number, since it is smaller than the sum of its proper divisors (338713800).

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

161291400 is a wasteful number, since it uses less digits than its factorization.

161291400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 268838 (or 268829 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 24.

The square root of 161291400 is about 12700.0551179906. The cubic root of 161291400 is about 544.3401941477.

The spelling of 161291400 in words is "one hundred sixty-one million, two hundred ninety-one thousand, four hundred".