31234440439 has 2 divisors, whose sum is σ = 31234440440. Its totient is φ = 31234440438.

The previous prime is 31234440437. The next prime is 31234440451. The reversal of 31234440439 is 93404443213.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31234440439 - 2¹ = 31234440437 is a prime.

Together with 31234440437, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 31234440398 and 31234440407.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31234440437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15617220219 + 15617220220.

It is an arithmetic number, because the mean of its divisors is an integer number (15617220220).

Almost surely, 2^31234440439 is an apocalyptic number.

31234440439 is a deficient number, since it is larger than the sum of its proper divisors (1).

31234440439 is an equidigital number, since it uses as much as digits as its factorization.

31234440439 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 124416, while the sum is 37.

The spelling of 31234440439 in words is "thirty-one billion, two hundred thirty-four million, four hundred forty thousand, four hundred thirty-nine".