180121525 has 6 divisors (see below), whose sum is σ = 223350722. Its totient is φ = 144097200.

The previous prime is 180121517. The next prime is 180121567. The reversal of 180121525 is 525121081.

It can be written as a sum of positive squares in 3 ways, for example, as 400689 + 179720836 = 633^2 + 13406^2 .

It is not a de Polignac number, because 180121525 - 2³ = 180121517 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25), and also a Moran number because the ratio is a prime number: 7204861 = 180121525 / (1 + 8 + 0 + 1 + 2 + 1 + 5 + 2 + 5).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 180121525.

It is a congruent 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, 3602406 + ... + 3602455.

Almost surely, 2^180121525 is an apocalyptic number.

It is an amenable number.

180121525 is a deficient number, since it is larger than the sum of its proper divisors (43229197).

180121525 is an equidigital number, since it uses as much as digits as its factorization.

180121525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7204871 (or 7204866 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 25.

The square root of 180121525 is about 13420.9360701853. The cubic root of 180121525 is about 564.7486547474.

The spelling of 180121525 in words is "one hundred eighty million, one hundred twenty-one thousand, five hundred twenty-five".