181916972 has 6 divisors (see below), whose sum is σ = 318354708. Its totient is φ = 90958484.

The previous prime is 181916927. The next prime is 181916989. The reversal of 181916972 is 279619181.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22739618 + ... + 22739625.

It is an arithmetic number, because the mean of its divisors is an integer number (53059118).

Almost surely, 2^181916972 is an apocalyptic number.

It is an amenable number.

181916972 is a deficient number, since it is larger than the sum of its proper divisors (136437736).

181916972 is a wasteful number, since it uses less digits than its factorization.

181916972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45479247 (or 45479245 counting only the distinct ones).

The product of its digits is 54432, while the sum is 44.

The square root of 181916972 is about 13487.6599897833. The cubic root of 181916972 is about 566.6189211599.

The spelling of 181916972 in words is "one hundred eighty-one million, nine hundred sixteen thousand, nine hundred seventy-two".