1231431 has 4 divisors (see below), whose sum is σ = 1641912. Its totient is φ = 820952.

The previous prime is 1231423. The next prime is 1231453. The reversal of 1231431 is 1341321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1341321 = 3 ⋅447107.

It is a cyclic number.

It is not a de Polignac number, because 1231431 - 2³ = 1231423 is a prime.

It is a super-2 number, since 2×1231431² = 3032844615522, which contains 22 as substring.

It is a D-number.

It is a self number, because there is not a number n which added to its sum of digits gives 1231431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231411) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 205236 + ... + 205241.

It is an arithmetic number, because the mean of its divisors is an integer number (410478).

2^1231431 is an apocalyptic number.

1231431 is a deficient number, since it is larger than the sum of its proper divisors (410481).

1231431 is an equidigital number, since it uses as much as digits as its factorization.

1231431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 410480.

The product of its digits is 72, while the sum is 15.

The square root of 1231431 is about 1109.6986077309. The cubic root of 1231431 is about 107.1856618809.

Adding to 1231431 its reverse (1341321), we get a palindrome (2572752).

The spelling of 1231431 in words is "one million, two hundred thirty-one thousand, four hundred thirty-one".