181281425 has 12 divisors (see below), whose sum is σ = 242080860. Its totient is φ = 133869120.

The previous prime is 181281409. The next prime is 181281427. The reversal of 181281425 is 524182181.

It can be written as a sum of positive squares in 6 ways, for example, as 620944 + 180660481 = 788^2 + 13441^2 .

It is not a de Polignac number, because 181281425 - 2⁴ = 181281409 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 181281391 and 181281400.

It is not an unprimeable number, because it can be changed into a prime (181281427) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 278570 + ... + 279219.

It is an arithmetic number, because the mean of its divisors is an integer number (20173405).

Almost surely, 2^181281425 is an apocalyptic number.

It is an amenable number.

181281425 is a deficient number, since it is larger than the sum of its proper divisors (60799435).

181281425 is a wasteful number, since it uses less digits than its factorization.

181281425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 557812 (or 557807 counting only the distinct ones).

The product of its digits is 5120, while the sum is 32.

The square root of 181281425 is about 13464.0790624535. The cubic root of 181281425 is about 565.9583026881.

The spelling of 181281425 in words is "one hundred eighty-one million, two hundred eighty-one thousand, four hundred twenty-five".