1521431343 has 20 divisors (see below), whose sum is σ = 2277481360. Its totient is φ = 1012178592.

The previous prime is 1521431341. The next prime is 1521431363. The reversal of 1521431343 is 3431341251.

It is a happy number.

1521431343 is a `hidden beast` number, since 1 + 521 + 4 + 3 + 134 + 3 = 666.

It is not a de Polignac number, because 1521431343 - 2¹ = 1521431341 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1521431341) 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 19 ways as a sum of consecutive naturals, for example, 20163 + ... + 58731.

It is an arithmetic number, because the mean of its divisors is an integer number (113874068).

Almost surely, 2^1521431343 is an apocalyptic number.

1521431343 is a deficient number, since it is larger than the sum of its proper divisors (756050017).

1521431343 is an equidigital number, since it uses as much as digits as its factorization.

1521431343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39068 (or 39059 counting only the distinct ones).

The product of its digits is 4320, while the sum is 27.

The square root of 1521431343 is about 39005.5296464488. The cubic root of 1521431343 is about 1150.1402079839.

Adding to 1521431343 its reverse (3431341251), we get a palindrome (4952772594).

The spelling of 1521431343 in words is "one billion, five hundred twenty-one million, four hundred thirty-one thousand, three hundred forty-three".