161397873 has 96 divisors (see below), whose sum is σ = 307322880. Its totient is φ = 81881280.

The previous prime is 161397871. The next prime is 161397883. The reversal of 161397873 is 378793161.

It is not a de Polignac number, because 161397873 - 2¹ = 161397871 is a prime.

It is not an unprimeable number, because it can be changed into a prime (161397871) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 990090 + ... + 990252.

It is an arithmetic number, because the mean of its divisors is an integer number (3201280).

Almost surely, 2^161397873 is an apocalyptic number.

161397873 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

161397873 is a deficient number, since it is larger than the sum of its proper divisors (145925007).

161397873 is a wasteful number, since it uses less digits than its factorization.

161397873 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 236 (or 217 counting only the distinct ones).

The product of its digits is 190512, while the sum is 45.

The square root of 161397873 is about 12704.2462586334. The cubic root of 161397873 is about 544.4599459035.

The spelling of 161397873 in words is "one hundred sixty-one million, three hundred ninety-seven thousand, eight hundred seventy-three".