181900625 has 10 divisors (see below), whose sum is σ = 227303802. Its totient is φ = 145520000.

The previous prime is 181900601. The next prime is 181900627. The reversal of 181900625 is 526009181.

It can be written as a sum of positive squares in 5 ways, for example, as 49098049 + 132802576 = 7007^2 + 11524^2 .

It is a de Polignac number, because none of the positive numbers 2^k-181900625 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 181900591 and 181900600.

It is not an unprimeable number, because it can be changed into a prime (181900627) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 144896 + ... + 146145.

Almost surely, 2^181900625 is an apocalyptic number.

It is an amenable number.

181900625 is a deficient number, since it is larger than the sum of its proper divisors (45403177).

181900625 is an frugal number, since it uses more digits than its factorization.

181900625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 291061 (or 291046 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 32.

The square root of 181900625 is about 13487.0539777966. The cubic root of 181900625 is about 566.6019485874.

The spelling of 181900625 in words is "one hundred eighty-one million, nine hundred thousand, six hundred twenty-five".