1231430352431 has 4 divisors (see below), whose sum is σ = 1231586217864. Its totient is φ = 1231274487000.

The previous prime is 1231430352407. The next prime is 1231430352437. The reversal of 1231430352431 is 1342530341321.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1231430352431 is a prime.

It is a super-2 number, since 2×1231430352431² (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 (1231430352437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 77920865 + ... + 77936666.

It is an arithmetic number, because the mean of its divisors is an integer number (307896554466).

Almost surely, 2^{1231430352431} is an apocalyptic number.

1231430352431 is a deficient number, since it is larger than the sum of its proper divisors (155865433).

1231430352431 is an equidigital number, since it uses as much as digits as its factorization.

1231430352431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155865432.

The product of its (nonzero) digits is 25920, while the sum is 32.

Adding to 1231430352431 its reverse (1342530341321), we get a palindrome (2573960693752).

The spelling of 1231430352431 in words is "one trillion, two hundred thirty-one billion, four hundred thirty million, three hundred fifty-two thousand, four hundred thirty-one".