181009964 has 12 divisors (see below), whose sum is σ = 318665424. Its totient is φ = 89962704.

The previous prime is 181009951. The next prime is 181009981. The reversal of 181009964 is 469900181.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 134819 + ... + 136154.

It is an arithmetic number, because the mean of its divisors is an integer number (26555452).

Almost surely, 2^181009964 is an apocalyptic number.

It is an amenable number.

181009964 is a deficient number, since it is larger than the sum of its proper divisors (137655460).

181009964 is a wasteful number, since it uses less digits than its factorization.

181009964 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 271144 (or 271142 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 38.

The square root of 181009964 is about 13453.9943511212. The cubic root of 181009964 is about 565.6756622977.

The spelling of 181009964 in words is "one hundred eighty-one million, nine thousand, nine hundred sixty-four".