431423523 has 8 divisors (see below), whose sum is σ = 639146000. Its totient is φ = 287615664.

The previous prime is 431423521. The next prime is 431423563. The reversal of 431423523 is 325324134.

It is not a de Polignac number, because 431423523 - 2¹ = 431423521 is a prime.

It is a super-2 number, since 2×431423523² = 372252512395463058, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 15978649 = 431423523 / (4 + 3 + 1 + 4 + 2 + 3 + 5 + 2 + 3).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (431423521) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7989298 + ... + 7989351.

It is an arithmetic number, because the mean of its divisors is an integer number (79893250).

Almost surely, 2^431423523 is an apocalyptic number.

431423523 is a deficient number, since it is larger than the sum of its proper divisors (207722477).

431423523 is a wasteful number, since it uses less digits than its factorization.

431423523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15978658 (or 15978652 counting only the distinct ones).

The product of its digits is 8640, while the sum is 27.

The square root of 431423523 is about 20770.7371799847. The cubic root of 431423523 is about 755.6162230753.

Adding to 431423523 its reverse (325324134), we get a palindrome (756747657).

It can be divided in two parts, 43142 and 3523, that added together give a triangular number (46665 = T₃₀₅).

The spelling of 431423523 in words is "four hundred thirty-one million, four hundred twenty-three thousand, five hundred twenty-three".