521416247 has 16 divisors (see below), whose sum is σ = 585664512. Its totient is φ = 460041120.

The previous prime is 521416223. The next prime is 521416253. The reversal of 521416247 is 742614125.

It is not a de Polignac number, because 521416247 - 2¹⁴ = 521399863 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 (521416547) 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, 187058 + ... + 189824.

It is an arithmetic number, because the mean of its divisors is an integer number (36604032).

Almost surely, 2^521416247 is an apocalyptic number.

521416247 is a deficient number, since it is larger than the sum of its proper divisors (64248265).

521416247 is a wasteful number, since it uses less digits than its factorization.

521416247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3278.

The product of its digits is 13440, while the sum is 32.

The square root of 521416247 is about 22834.5406566456. The cubic root of 521416247 is about 804.8745336397.

The spelling of 521416247 in words is "five hundred twenty-one million, four hundred sixteen thousand, two hundred forty-seven".