1521425725 has 6 divisors (see below), whose sum is σ = 1886567930. Its totient is φ = 1217140560.

The previous prime is 1521425623. The next prime is 1521425729. The reversal of 1521425725 is 5275241251.

It can be written as a sum of positive squares in 3 ways, for example, as 53846244 + 1467579481 = 7338^2 + 38309^2 .

It is not a de Polignac number, because 1521425725 - 2²⁵ = 1487871293 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1521425729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 30428490 + ... + 30428539.

Almost surely, 2^1521425725 is an apocalyptic number.

It is an amenable number.

1521425725 is a deficient number, since it is larger than the sum of its proper divisors (365142205).

1521425725 is an equidigital number, since it uses as much as digits as its factorization.

1521425725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60857039 (or 60857034 counting only the distinct ones).

The product of its digits is 28000, while the sum is 34.

The square root of 1521425725 is about 39005.4576309521. The cubic root of 1521425725 is about 1150.1387923223.

Adding to 1521425725 its reverse (5275241251), we get a palindrome (6796666976).

The spelling of 1521425725 in words is "one billion, five hundred twenty-one million, four hundred twenty-five thousand, seven hundred twenty-five".