31103434987 has 2 divisors, whose sum is σ = 31103434988. Its totient is φ = 31103434986.

The previous prime is 31103434969. The next prime is 31103435021. The reversal of 31103434987 is 78943430113.

It is a weak prime.

It is an emirp because it is prime and its reverse (78943430113) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31103434987 is a prime.

It is not a weakly prime, because it can be changed into another prime (31103434927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15551717493 + 15551717494.

It is an arithmetic number, because the mean of its divisors is an integer number (15551717494).

Almost surely, 2^31103434987 is an apocalyptic number.

31103434987 is a deficient number, since it is larger than the sum of its proper divisors (1).

31103434987 is an equidigital number, since it uses as much as digits as its factorization.

31103434987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 217728, while the sum is 43.

The spelling of 31103434987 in words is "thirty-one billion, one hundred three million, four hundred thirty-four thousand, nine hundred eighty-seven".