520258421 has 4 divisors (see below), whose sum is σ = 524355072. Its totient is φ = 516161772.

The previous prime is 520258379. The next prime is 520258439. The reversal of 520258421 is 124852025.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 520258421 - 2⁶ = 520258357 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (520258121) 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, 2048135 + ... + 2048388.

It is an arithmetic number, because the mean of its divisors is an integer number (131088768).

Almost surely, 2^520258421 is an apocalyptic number.

It is an amenable number.

520258421 is a deficient number, since it is larger than the sum of its proper divisors (4096651).

520258421 is a wasteful number, since it uses less digits than its factorization.

520258421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4096650.

The product of its (nonzero) digits is 6400, while the sum is 29.

The square root of 520258421 is about 22809.1740534374. The cubic root of 520258421 is about 804.2783399098.

The spelling of 520258421 in words is "five hundred twenty million, two hundred fifty-eight thousand, four hundred twenty-one".