521235477 has 12 divisors (see below), whose sum is σ = 860452320. Its totient is φ = 297848808.

The previous prime is 521235433. The next prime is 521235497. The reversal of 521235477 is 774532125.

It is not a de Polignac number, because 521235477 - 2⁷ = 521235349 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521235427) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4136727 + ... + 4136852.

It is an arithmetic number, because the mean of its divisors is an integer number (71704360).

Almost surely, 2^521235477 is an apocalyptic number.

It is an amenable number.

521235477 is a deficient number, since it is larger than the sum of its proper divisors (339216843).

521235477 is a wasteful number, since it uses less digits than its factorization.

521235477 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8273592 (or 8273589 counting only the distinct ones).

The product of its digits is 58800, while the sum is 36.

The square root of 521235477 is about 22830.5820556551. The cubic root of 521235477 is about 804.7815088009.

It can be divided in two parts, 52123 and 5477, that added together give a square (57600 = 240²).

The spelling of 521235477 in words is "five hundred twenty-one million, two hundred thirty-five thousand, four hundred seventy-seven".