31434243391 has 2 divisors, whose sum is σ = 31434243392. Its totient is φ = 31434243390.

The previous prime is 31434243353. The next prime is 31434243413. The reversal of 31434243391 is 19334243413.

It is a strong prime.

It is an emirp because it is prime and its reverse (19334243413) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31434243391 - 2¹¹ = 31434241343 is a prime.

It is a super-2 number, since 2×31434243391² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 31434243391.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31434240391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15717121695 + 15717121696.

It is an arithmetic number, because the mean of its divisors is an integer number (15717121696).

Almost surely, 2^31434243391 is an apocalyptic number.

31434243391 is a deficient number, since it is larger than the sum of its proper divisors (1).

31434243391 is an equidigital number, since it uses as much as digits as its factorization.

31434243391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 93312, while the sum is 37.

The spelling of 31434243391 in words is "thirty-one billion, four hundred thirty-four million, two hundred forty-three thousand, three hundred ninety-one".