161586874 has 4 divisors (see below), whose sum is σ = 242380314. Its totient is φ = 80793436.

The previous prime is 161586871. The next prime is 161586883. The reversal of 161586874 is 478685161.

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

It can be written as a sum of positive squares in only one way, i.e., 161467849 + 119025 = 12707^2 + 345^2 .

It is a super-2 number, since 2×161586874² = 52220635698183752, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (161586871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40396717 + ... + 40396720.

Almost surely, 2^161586874 is an apocalyptic number.

161586874 is a deficient number, since it is larger than the sum of its proper divisors (80793440).

161586874 is an equidigital number, since it uses as much as digits as its factorization.

161586874 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80793439.

The product of its digits is 322560, while the sum is 46.

The square root of 161586874 is about 12711.6825794228. The cubic root of 161586874 is about 544.6723884653.

It can be divided in two parts, 16158 and 6874, that added together give a palindrome (23032).

The spelling of 161586874 in words is "one hundred sixty-one million, five hundred eighty-six thousand, eight hundred seventy-four".