31143643439 has 2 divisors, whose sum is σ = 31143643440. Its totient is φ = 31143643438.

The previous prime is 31143643423. The next prime is 31143643457. The reversal of 31143643439 is 93434634113.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31143643439 - 2⁴ = 31143643423 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31143643396 and 31143643405.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31143643339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15571821719 + 15571821720.

It is an arithmetic number, because the mean of its divisors is an integer number (15571821720).

Almost surely, 2^31143643439 is an apocalyptic number.

31143643439 is a deficient number, since it is larger than the sum of its proper divisors (1).

31143643439 is an equidigital number, since it uses as much as digits as its factorization.

31143643439 is an evil number, because the sum of its binary digits is even.

The product of its digits is 279936, while the sum is 41.

The spelling of 31143643439 in words is "thirty-one billion, one hundred forty-three million, six hundred forty-three thousand, four hundred thirty-nine".