181940425 has 6 divisors (see below), whose sum is σ = 225606158. Its totient is φ = 145552320.

The previous prime is 181940413. The next prime is 181940441. The reversal of 181940425 is 524049181.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 9884736 + 172055689 = 3144^2 + 13117^2 .

It is not a de Polignac number, because 181940425 - 2¹¹ = 181938377 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3638784 + ... + 3638833.

Almost surely, 2^181940425 is an apocalyptic number.

It is an amenable number.

181940425 is a deficient number, since it is larger than the sum of its proper divisors (43665733).

181940425 is an equidigital number, since it uses as much as digits as its factorization.

181940425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7277627 (or 7277622 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 34.

The square root of 181940425 is about 13488.5293861117. The cubic root of 181940425 is about 566.6432698914.

The spelling of 181940425 in words is "one hundred eighty-one million, nine hundred forty thousand, four hundred twenty-five".