521971086 has 32 divisors (see below), whose sum is σ = 1284853248. Its totient is φ = 137662560.

The previous prime is 521971081. The next prime is 521971127. The reversal of 521971086 is 680179125.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521971081) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 477450 + ... + 478541.

It is an arithmetic number, because the mean of its divisors is an integer number (40151664).

Almost surely, 2^521971086 is an apocalyptic number.

521971086 is an abundant number, since it is smaller than the sum of its proper divisors (762882162).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

521971086 is a wasteful number, since it uses less digits than its factorization.

521971086 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 956016.

The product of its (nonzero) digits is 30240, while the sum is 39.

The square root of 521971086 is about 22846.6865431292. The cubic root of 521971086 is about 805.1599214190.

The spelling of 521971086 in words is "five hundred twenty-one million, nine hundred seventy-one thousand, eighty-six".