521477631 has 6 divisors (see below), whose sum is σ = 753245480. Its totient is φ = 347651748.

The previous prime is 521477609. The next prime is 521477633. The reversal of 521477631 is 136774125.

It is a happy number.

521477631 is a `hidden beast` number, since 5 + 2 + 14 + 7 + 7 + 631 = 666.

It is not a de Polignac number, because 521477631 - 2⁹ = 521477119 is a prime.

It is a super-2 number, since 2×521477631² = 543877839266744322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521477633) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 28970971 + ... + 28970988.

Almost surely, 2^521477631 is an apocalyptic number.

521477631 is a deficient number, since it is larger than the sum of its proper divisors (231767849).

521477631 is a wasteful number, since it uses less digits than its factorization.

521477631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57941965 (or 57941962 counting only the distinct ones).

The product of its digits is 35280, while the sum is 36.

The square root of 521477631 is about 22835.8847212014. The cubic root of 521477631 is about 804.9061171586.

The spelling of 521477631 in words is "five hundred twenty-one million, four hundred seventy-seven thousand, six hundred thirty-one".