31212013199987 has 2 divisors, whose sum is σ = 31212013199988. Its totient is φ = 31212013199986.

The previous prime is 31212013199977. The next prime is 31212013199993. The reversal of 31212013199987 is 78999131021213.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31212013199987 - 2⁶ = 31212013199923 is a prime.

It is not a weakly prime, because it can be changed into another prime (31212013199977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15606006599993 + 15606006599994.

It is an arithmetic number, because the mean of its divisors is an integer number (15606006599994).

Almost surely, 2^{31212013199987} is an apocalyptic number.

31212013199987 is a deficient number, since it is larger than the sum of its proper divisors (1).

31212013199987 is an equidigital number, since it uses as much as digits as its factorization.

31212013199987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1469664, while the sum is 56.

The spelling of 31212013199987 in words is "thirty-one trillion, two hundred twelve billion, thirteen million, one hundred ninety-nine thousand, nine hundred eighty-seven".