513647972 has 6 divisors (see below), whose sum is σ = 898883958. Its totient is φ = 256823984.

The previous prime is 513647969. The next prime is 513647989. The reversal of 513647972 is 279746315.

It can be written as a sum of positive squares in only one way, i.e., 427083556 + 86564416 = 20666^2 + 9304^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64205993 + ... + 64206000.

It is an arithmetic number, because the mean of its divisors is an integer number (149813993).

Almost surely, 2^513647972 is an apocalyptic number.

It is an amenable number.

513647972 is a deficient number, since it is larger than the sum of its proper divisors (385235986).

513647972 is a wasteful number, since it uses less digits than its factorization.

513647972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128411997 (or 128411995 counting only the distinct ones).

The product of its digits is 317520, while the sum is 44.

The square root of 513647972 is about 22663.8031230418. The cubic root of 513647972 is about 800.8573995043.

The spelling of 513647972 in words is "five hundred thirteen million, six hundred forty-seven thousand, nine hundred seventy-two".