531031431 has 32 divisors (see below), whose sum is σ = 859921920. Its totient is φ = 285541248.

The previous prime is 531031421. The next prime is 531031439. The reversal of 531031431 is 134130135.

It is not a de Polignac number, because 531031431 - 2¹¹ = 531029383 is a prime.

It is a super-2 number, since 2×531031431² = 563988761419815522, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a junction number, because it is equal to n+sod(n) for n = 531031398 and 531031407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (531031439) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 100600 + ... + 105746.

It is an arithmetic number, because the mean of its divisors is an integer number (26872560).

Almost surely, 2^531031431 is an apocalyptic number.

531031431 is a gapful number since it is divisible by the number (51) formed by its first and last digit.

531031431 is a deficient number, since it is larger than the sum of its proper divisors (328890489).

531031431 is an equidigital number, since it uses as much as digits as its factorization.

531031431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5208 (or 5174 counting only the distinct ones).

The product of its (nonzero) digits is 540, while the sum is 21.

The square root of 531031431 is about 23044.1192281241. The cubic root of 531031431 is about 809.7918639130.

Adding to 531031431 its reverse (134130135), we get a palindrome (665161566).

The spelling of 531031431 in words is "five hundred thirty-one million, thirty-one thousand, four hundred thirty-one".