1231242431 has 4 divisors (see below), whose sum is σ = 1232640864. Its totient is φ = 1229844000.

The previous prime is 1231242421. The next prime is 1231242491. The reversal of 1231242431 is 1342421321.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1231242431 - 2¹⁴ = 1231226047 is a prime.

It is a super-2 number, since 2×1231242431² = 3031915847789579522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1231242397 and 1231242406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231242421) 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, 697895 + ... + 699656.

It is an arithmetic number, because the mean of its divisors is an integer number (308160216).

Almost surely, 2^1231242431 is an apocalyptic number.

1231242431 is a deficient number, since it is larger than the sum of its proper divisors (1398433).

1231242431 is an equidigital number, since it uses as much as digits as its factorization.

1231242431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1398432.

The product of its digits is 1152, while the sum is 23.

The square root of 1231242431 is about 35089.0642650955. The cubic root of 1231242431 is about 1071.8019048898.

Adding to 1231242431 its reverse (1342421321), we get a palindrome (2573663752).

The spelling of 1231242431 in words is "one billion, two hundred thirty-one million, two hundred forty-two thousand, four hundred thirty-one".