161874929 has 6 divisors (see below), whose sum is σ = 165906594. Its totient is φ = 157847280.

The previous prime is 161874899. The next prime is 161874931. The reversal of 161874929 is 929478161.

It can be written as a sum of positive squares in only one way, i.e., 98704225 + 63170704 = 9935^2 + 7948^2 .

It is not a de Polignac number, because 161874929 - 2⁸ = 161874673 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161874949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 80474 + ... + 82460.

It is an arithmetic number, because the mean of its divisors is an integer number (27651099).

Almost surely, 2^161874929 is an apocalyptic number.

It is an amenable number.

161874929 is a deficient number, since it is larger than the sum of its proper divisors (4031665).

161874929 is an frugal number, since it uses more digits than its factorization.

161874929 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4015 (or 2028 counting only the distinct ones).

The product of its digits is 217728, while the sum is 47.

The square root of 161874929 is about 12723.0078597791. The cubic root of 161874929 is about 544.9958521694.

The spelling of 161874929 in words is "one hundred sixty-one million, eight hundred seventy-four thousand, nine hundred twenty-nine".