31231319949187 has 2 divisors, whose sum is σ = 31231319949188. Its totient is φ = 31231319949186.

The previous prime is 31231319949139. The next prime is 31231319949227. The reversal of 31231319949187 is 78194991313213.

It is a strong prime.

It is an emirp because it is prime and its reverse (78194991313213) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31231319949187 - 2⁷ = 31231319949059 is a prime.

It is not a weakly prime, because it can be changed into another prime (31231319949787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15615659974593 + 15615659974594.

It is an arithmetic number, because the mean of its divisors is an integer number (15615659974594).

Almost surely, 2^{31231319949187} is an apocalyptic number.

31231319949187 is a deficient number, since it is larger than the sum of its proper divisors (1).

31231319949187 is an equidigital number, since it uses as much as digits as its factorization.

31231319949187 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8817984, while the sum is 61.

The spelling of 31231319949187 in words is "thirty-one trillion, two hundred thirty-one billion, three hundred nineteen million, nine hundred forty-nine thousand, one hundred eighty-seven".