31857885343 has 2 divisors, whose sum is σ = 31857885344. Its totient is φ = 31857885342.

The previous prime is 31857885331. The next prime is 31857885349. The reversal of 31857885343 is 34358875813.

It is a strong prime.

It is an emirp because it is prime and its reverse (34358875813) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31857885343 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31857885349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15928942671 + 15928942672.

It is an arithmetic number, because the mean of its divisors is an integer number (15928942672).

Almost surely, 2^31857885343 is an apocalyptic number.

31857885343 is a deficient number, since it is larger than the sum of its proper divisors (1).

31857885343 is an equidigital number, since it uses as much as digits as its factorization.

31857885343 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9676800, while the sum is 55.

The spelling of 31857885343 in words is "thirty-one billion, eight hundred fifty-seven million, eight hundred eighty-five thousand, three hundred forty-three".