161385975 has 18 divisors (see below), whose sum is σ = 289060616. Its totient is φ = 86072400.

The previous prime is 161385967. The next prime is 161385989. The reversal of 161385975 is 579583161.

It is a happy number.

It is not a de Polignac number, because 161385975 - 2³ = 161385967 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 161385975.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 358411 + ... + 358860.

Almost surely, 2^161385975 is an apocalyptic number.

161385975 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

161385975 is a deficient number, since it is larger than the sum of its proper divisors (127674641).

161385975 is a wasteful number, since it uses less digits than its factorization.

161385975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 717287 (or 717279 counting only the distinct ones).

The product of its digits is 226800, while the sum is 45.

The square root of 161385975 is about 12703.7779813723. Note that the first 3 decimals coincide. The cubic root of 161385975 is about 544.4465666615.

The spelling of 161385975 in words is "one hundred sixty-one million, three hundred eighty-five thousand, nine hundred seventy-five".