181630625 has 40 divisors (see below), whose sum is σ = 256417920. Its totient is φ = 127400000.

The previous prime is 181630621. The next prime is 181630637. The reversal of 181630625 is 526036181.

It is a happy number.

It is not a de Polignac number, because 181630625 - 2² = 181630621 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 181630591 and 181630600.

It is not an unprimeable number, because it can be changed into a prime (181630621) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 198920 + ... + 199830.

It is an arithmetic number, because the mean of its divisors is an integer number (6410448).

Almost surely, 2^181630625 is an apocalyptic number.

It is an amenable number.

181630625 is a deficient number, since it is larger than the sum of its proper divisors (74787295).

181630625 is an equidigital number, since it uses as much as digits as its factorization.

181630625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 971 (or 956 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 181630625 is about 13477.0406618070. The cubic root of 181630625 is about 566.3214689196.

The spelling of 181630625 in words is "one hundred eighty-one million, six hundred thirty thousand, six hundred twenty-five".