31143615493 has 2 divisors, whose sum is σ = 31143615494. Its totient is φ = 31143615492.

The previous prime is 31143615463. The next prime is 31143615551. The reversal of 31143615493 is 39451634113.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16249365729 + 14894249764 = 127473^2 + 122042^2 .

It is an emirp because it is prime and its reverse (39451634113) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31143615493 - 2²¹ = 31141518341 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31143615463) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15571807746 + 15571807747.

It is an arithmetic number, because the mean of its divisors is an integer number (15571807747).

Almost surely, 2^31143615493 is an apocalyptic number.

It is an amenable number.

31143615493 is a deficient number, since it is larger than the sum of its proper divisors (1).

31143615493 is an equidigital number, since it uses as much as digits as its factorization.

31143615493 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 116640, while the sum is 40.

The spelling of 31143615493 in words is "thirty-one billion, one hundred forty-three million, six hundred fifteen thousand, four hundred ninety-three".