161359999 has 4 divisors (see below), whose sum is σ = 162071064. Its totient is φ = 160648936.

The previous prime is 161359993. The next prime is 161360011. The reversal of 161359999 is 999953161.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 161359999 - 2²⁵ = 127805567 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161359993) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 355192 + ... + 355645.

It is an arithmetic number, because the mean of its divisors is an integer number (40517766).

Almost surely, 2^161359999 is an apocalyptic number.

161359999 is a deficient number, since it is larger than the sum of its proper divisors (711065).

161359999 is an equidigital number, since it uses as much as digits as its factorization.

161359999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 711064.

The product of its digits is 590490, while the sum is 52.

The square root of 161359999 is about 12702.7555671988. The cubic root of 161359999 is about 544.4173544930.

The spelling of 161359999 in words is "one hundred sixty-one million, three hundred fifty-nine thousand, nine hundred ninety-nine".