521098407 has 8 divisors (see below), whose sum is σ = 771997680. Its totient is φ = 347398920.

The previous prime is 521098393. The next prime is 521098411. The reversal of 521098407 is 704890125.

521098407 is a `hidden beast` number, since 521 + 0 + 98 + 40 + 7 = 666.

It is not a de Polignac number, because 521098407 - 2¹⁸ = 520836263 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521098307) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9649944 + ... + 9649997.

It is an arithmetic number, because the mean of its divisors is an integer number (96499710).

Almost surely, 2^521098407 is an apocalyptic number.

521098407 is a deficient number, since it is larger than the sum of its proper divisors (250899273).

521098407 is a wasteful number, since it uses less digits than its factorization.

521098407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19299950 (or 19299944 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

The square root of 521098407 is about 22827.5799637193. The cubic root of 521098407 is about 804.7109577882.

It can be divided in two parts, 52109 and 8407, that added together give a square (60516 = 246²).

The spelling of 521098407 in words is "five hundred twenty-one million, ninety-eight thousand, four hundred seven".