521354431 has 16 divisors (see below), whose sum is σ = 585446400. Its totient is φ = 460954368.

The previous prime is 521354429. The next prime is 521354447. The reversal of 521354431 is 134453125.

It is a cyclic number.

It is not a de Polignac number, because 521354431 - 2¹ = 521354429 is a prime.

It is a super-2 number, since 2×521354431² = 543620885446667522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 521354431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521354411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42435 + ... + 53323.

It is an arithmetic number, because the mean of its divisors is an integer number (36590400).

Almost surely, 2^521354431 is an apocalyptic number.

521354431 is a deficient number, since it is larger than the sum of its proper divisors (64091969).

521354431 is a wasteful number, since it uses less digits than its factorization.

521354431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11058.

The product of its digits is 7200, while the sum is 28.

The square root of 521354431 is about 22833.1870530594. The cubic root of 521354431 is about 804.8427253414.

The spelling of 521354431 in words is "five hundred twenty-one million, three hundred fifty-four thousand, four hundred thirty-one".