1231423501431 has 4 divisors (see below), whose sum is σ = 1641898001912. Its totient is φ = 820949000952.

The previous prime is 1231423501417. The next prime is 1231423501447. The reversal of 1231423501431 is 1341053241321.

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

It is not a de Polignac number, because 1231423501431 - 2¹⁰ = 1231423500407 is a prime.

It is a super-2 number, since 2×1231423501431² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231423501031) 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, 205237250236 + ... + 205237250241.

It is an arithmetic number, because the mean of its divisors is an integer number (410474500478).

Almost surely, 2^{1231423501431} is an apocalyptic number.

1231423501431 is a deficient number, since it is larger than the sum of its proper divisors (410474500481).

1231423501431 is an equidigital number, since it uses as much as digits as its factorization.

1231423501431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 410474500480.

The product of its (nonzero) digits is 8640, while the sum is 30.

Adding to 1231423501431 its reverse (1341053241321), we get a palindrome (2572476742752).

The spelling of 1231423501431 in words is "one trillion, two hundred thirty-one billion, four hundred twenty-three million, five hundred one thousand, four hundred thirty-one".