1521142900 has 36 divisors (see below), whose sum is σ = 3302601120. Its totient is φ = 608140000.

The previous prime is 1521142891. The next prime is 1521142913. The reversal of 1521142900 is 92411251.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 322761 + ... + 327439.

It is an arithmetic number, because the mean of its divisors is an integer number (91738920).

Almost surely, 2^1521142900 is an apocalyptic number.

1521142900 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1521142900 is an abundant number, since it is smaller than the sum of its proper divisors (1781458220).

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

1521142900 is a wasteful number, since it uses less digits than its factorization.

1521142900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7944 (or 7937 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 25.

The square root of 1521142900 is about 39001.8320082532. The cubic root of 1521142900 is about 1150.0675196651.

The spelling of 1521142900 in words is "one billion, five hundred twenty-one million, one hundred forty-two thousand, nine hundred".