1521250225 has 12 divisors (see below), whose sum is σ = 2057837040. Its totient is φ = 1106363600.

The previous prime is 1521250223. The next prime is 1521250231. The reversal of 1521250225 is 5220521251.

It is not a de Polignac number, because 1521250225 - 2¹ = 1521250223 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a self number, because there is not a number n which added to its sum of digits gives 1521250225.

It is not an unprimeable number, because it can be changed into a prime (1521250223) 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, 2765635 + ... + 2766184.

It is an arithmetic number, because the mean of its divisors is an integer number (171486420).

Almost surely, 2^1521250225 is an apocalyptic number.

It is an amenable number.

1521250225 is a deficient number, since it is larger than the sum of its proper divisors (536586815).

1521250225 is a wasteful number, since it uses less digits than its factorization.

1521250225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5531840 (or 5531835 counting only the distinct ones).

The product of its (nonzero) digits is 2000, while the sum is 25.

The square root of 1521250225 is about 39003.2078808910. The cubic root of 1521250225 is about 1150.0945668925.

Adding to 1521250225 its reverse (5220521251), we get a palindrome (6741771476).

The spelling of 1521250225 in words is "one billion, five hundred twenty-one million, two hundred fifty thousand, two hundred twenty-five".