31423434431 has 2 divisors, whose sum is σ = 31423434432. Its totient is φ = 31423434430.

The previous prime is 31423434421. The next prime is 31423434437. The reversal of 31423434431 is 13443432413.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31423434431 is a prime.

It is a super-2 number, since 2×31423434431² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31423434437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15711717215 + 15711717216.

It is an arithmetic number, because the mean of its divisors is an integer number (15711717216).

Almost surely, 2^31423434431 is an apocalyptic number.

31423434431 is a deficient number, since it is larger than the sum of its proper divisors (1).

31423434431 is an equidigital number, since it uses as much as digits as its factorization.

31423434431 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 41472, while the sum is 32.

Adding to 31423434431 its reverse (13443432413), we get a palindrome (44866866844).

The spelling of 31423434431 in words is "thirty-one billion, four hundred twenty-three million, four hundred thirty-four thousand, four hundred thirty-one".