161619894 has 32 divisors (see below), whose sum is σ = 359706240. Its totient is φ = 53790696.

The previous prime is 161619877. The next prime is 161619911. The reversal of 161619894 is 498916161.

It is an interprime number because it is at equal distance from previous prime (161619877) and next prime (161619911).

It is a super-2 number, since 2×161619894² = 52241980273142472, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40597 + ... + 44399.

It is an arithmetic number, because the mean of its divisors is an integer number (11240820).

Almost surely, 2^161619894 is an apocalyptic number.

161619894 is an abundant number, since it is smaller than the sum of its proper divisors (198086346).

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

161619894 is a wasteful number, since it uses less digits than its factorization.

161619894 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4601 (or 4595 counting only the distinct ones).

The product of its digits is 93312, while the sum is 45.

The square root of 161619894 is about 12712.9813183218. The cubic root of 161619894 is about 544.7094868939.

The spelling of 161619894 in words is "one hundred sixty-one million, six hundred nineteen thousand, eight hundred ninety-four".