161874725 has 12 divisors (see below), whose sum is σ = 201134820. Its totient is φ = 129235200.

The previous prime is 161874719. The next prime is 161874733. The reversal of 161874725 is 527478161.

It can be written as a sum of positive squares in 6 ways, for example, as 9278116 + 152596609 = 3046^2 + 12353^2 .

It is not a de Polignac number, because 161874725 - 2⁴ = 161874709 is a prime.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6365 + ... + 19085.

It is an arithmetic number, because the mean of its divisors is an integer number (16761235).

Almost surely, 2^161874725 is an apocalyptic number.

It is an amenable number.

161874725 is a deficient number, since it is larger than the sum of its proper divisors (39260095).

161874725 is a wasteful number, since it uses less digits than its factorization.

161874725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13240 (or 13235 counting only the distinct ones).

The product of its digits is 94080, while the sum is 41.

The square root of 161874725 is about 12722.9998428044. Note that the first 3 decimals coincide. The cubic root of 161874725 is about 544.9956232289.

The spelling of 161874725 in words is "one hundred sixty-one million, eight hundred seventy-four thousand, seven hundred twenty-five".