521679892 has 6 divisors (see below), whose sum is σ = 912939818. Its totient is φ = 260839944.

The previous prime is 521679887. The next prime is 521679919. The reversal of 521679892 is 298976125.

It can be written as a sum of positive squares in only one way, i.e., 445885456 + 75794436 = 21116^2 + 8706^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65209983 + ... + 65209990.

Almost surely, 2^521679892 is an apocalyptic number.

It is an amenable number.

521679892 is a deficient number, since it is larger than the sum of its proper divisors (391259926).

521679892 is a wasteful number, since it uses less digits than its factorization.

521679892 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130419977 (or 130419975 counting only the distinct ones).

The product of its digits is 544320, while the sum is 49.

The square root of 521679892 is about 22840.3128700112. The cubic root of 521679892 is about 805.0101676892.

The spelling of 521679892 in words is "five hundred twenty-one million, six hundred seventy-nine thousand, eight hundred ninety-two".