31424044391 has 2 divisors, whose sum is σ = 31424044392. Its totient is φ = 31424044390.

The previous prime is 31424044361. The next prime is 31424044403. The reversal of 31424044391 is 19344042413.

It is a strong prime.

It is an emirp because it is prime and its reverse (19344042413) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31424044391 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31424044361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15712022195 + 15712022196.

It is an arithmetic number, because the mean of its divisors is an integer number (15712022196).

Almost surely, 2^31424044391 is an apocalyptic number.

31424044391 is a deficient number, since it is larger than the sum of its proper divisors (1).

31424044391 is an equidigital number, since it uses as much as digits as its factorization.

31424044391 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 41472, while the sum is 35.

The spelling of 31424044391 in words is "thirty-one billion, four hundred twenty-four million, forty-four thousand, three hundred ninety-one".