521632487 has 4 divisors (see below), whose sum is σ = 524335440. Its totient is φ = 518929536.

The previous prime is 521632451. The next prime is 521632537. The reversal of 521632487 is 784236125.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 521632487 - 2¹⁶ = 521566951 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 521632487.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521632087) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1351187 + ... + 1351572.

It is an arithmetic number, because the mean of its divisors is an integer number (131083860).

Almost surely, 2^521632487 is an apocalyptic number.

521632487 is a deficient number, since it is larger than the sum of its proper divisors (2702953).

521632487 is a wasteful number, since it uses less digits than its factorization.

521632487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2702952.

The product of its digits is 80640, while the sum is 38.

The square root of 521632487 is about 22839.2750979535. The cubic root of 521632487 is about 804.9857832192.

The spelling of 521632487 in words is "five hundred twenty-one million, six hundred thirty-two thousand, four hundred eighty-seven".