1521564636 has 12 divisors (see below), whose sum is σ = 3550317512. Its totient is φ = 507188208.

The previous prime is 1521564587. The next prime is 1521564647. The reversal of 1521564636 is 6364651251.

It is a tau number, because it is divible by the number of its divisors (12).

It is a junction number, because it is equal to n+sod(n) for n = 1521564594 and 1521564603.

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, 63398515 + ... + 63398538.

Almost surely, 2^1521564636 is an apocalyptic number.

It is an amenable number.

1521564636 is an abundant number, since it is smaller than the sum of its proper divisors (2028752876).

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

1521564636 is a wasteful number, since it uses less digits than its factorization.

1521564636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126797060 (or 126797058 counting only the distinct ones).

The product of its digits is 129600, while the sum is 39.

The square root of 1521564636 is about 39007.2382513810. The cubic root of 1521564636 is about 1150.1737950318.

The spelling of 1521564636 in words is "one billion, five hundred twenty-one million, five hundred sixty-four thousand, six hundred thirty-six".