31155337643 has 2 divisors, whose sum is σ = 31155337644. Its totient is φ = 31155337642.

The previous prime is 31155337583. The next prime is 31155337649. The reversal of 31155337643 is 34673355113.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31155337643 - 2²² = 31151143339 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31155337643.

It is not a weakly prime, because it can be changed into another prime (31155337649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15577668821 + 15577668822.

It is an arithmetic number, because the mean of its divisors is an integer number (15577668822).

Almost surely, 2^31155337643 is an apocalyptic number.

31155337643 is a deficient number, since it is larger than the sum of its proper divisors (1).

31155337643 is an equidigital number, since it uses as much as digits as its factorization.

31155337643 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 340200, while the sum is 41.

The spelling of 31155337643 in words is "thirty-one billion, one hundred fifty-five million, three hundred thirty-seven thousand, six hundred forty-three".