521145431 has 8 divisors (see below), whose sum is σ = 544065504. Its totient is φ = 498247200.

The previous prime is 521145413. The next prime is 521145437. The reversal of 521145431 is 134541125.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 521145431 - 2⁶ = 521145367 is a prime.

It is a super-2 number, since 2×521145431² = 543185120504351522, 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 521145431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521145437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 60281 + ... + 68381.

It is an arithmetic number, because the mean of its divisors is an integer number (68008188).

Almost surely, 2^521145431 is an apocalyptic number.

521145431 is a deficient number, since it is larger than the sum of its proper divisors (22920073).

521145431 is a wasteful number, since it uses less digits than its factorization.

521145431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10921.

The product of its digits is 2400, while the sum is 26.

The square root of 521145431 is about 22828.6099226387. The cubic root of 521145431 is about 804.7351628067.

Adding to 521145431 its reverse (134541125), we get a palindrome (655686556).

The spelling of 521145431 in words is "five hundred twenty-one million, one hundred forty-five thousand, four hundred thirty-one".