1525251920 has 20 divisors (see below), whose sum is σ = 3546210900. Its totient is φ = 610100736.

The previous prime is 1525251911. The next prime is 1525251953. The reversal of 1525251920 is 291525251.

It can be written as a sum of positive squares in 2 ways, for example, as 1091113024 + 434138896 = 33032^2 + 20836^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9532745 + ... + 9532904.

It is an arithmetic number, because the mean of its divisors is an integer number (177310545).

Almost surely, 2^1525251920 is an apocalyptic number.

1525251920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1525251920 is an abundant number, since it is smaller than the sum of its proper divisors (2020958980).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1525251920 is a wasteful number, since it uses less digits than its factorization.

1525251920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19065662 (or 19065656 counting only the distinct ones).

The product of its (nonzero) digits is 9000, while the sum is 32.

The square root of 1525251920 is about 39054.4737514155. The cubic root of 1525251920 is about 1151.1021368436.

The spelling of 1525251920 in words is "one billion, five hundred twenty-five million, two hundred fifty-one thousand, nine hundred twenty".