181989051 has 16 divisors (see below), whose sum is σ = 249627168. Its totient is φ = 117849600.

The previous prime is 181989023. The next prime is 181989053. The reversal of 181989051 is 150989181.

It is not a de Polignac number, because 181989051 - 2⁶ = 181988987 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 181988994 and 181989012.

It is not an unprimeable number, because it can be changed into a prime (181989053) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 96861 + ... + 98721.

It is an arithmetic number, because the mean of its divisors is an integer number (15601698).

Almost surely, 2^181989051 is an apocalyptic number.

181989051 is a deficient number, since it is larger than the sum of its proper divisors (67638117).

181989051 is a wasteful number, since it uses less digits than its factorization.

181989051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2782.

The product of its (nonzero) digits is 25920, while the sum is 42.

The square root of 181989051 is about 13490.3317601903. The cubic root of 181989051 is about 566.6937463799.

The spelling of 181989051 in words is "one hundred eighty-one million, nine hundred eighty-nine thousand, fifty-one".