31994000279 has 2 divisors, whose sum is σ = 31994000280. Its totient is φ = 31994000278.

The previous prime is 31994000251. The next prime is 31994000303. The reversal of 31994000279 is 97200049913.

It is a strong prime.

It is an emirp because it is prime and its reverse (97200049913) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31994000279 - 2⁸ = 31994000023 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31994000209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15997000139 + 15997000140.

It is an arithmetic number, because the mean of its divisors is an integer number (15997000140).

Almost surely, 2^31994000279 is an apocalyptic number.

31994000279 is a deficient number, since it is larger than the sum of its proper divisors (1).

31994000279 is an equidigital number, since it uses as much as digits as its factorization.

31994000279 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 122472, while the sum is 44.

The spelling of 31994000279 in words is "thirty-one billion, nine hundred ninety-four million, two hundred seventy-nine", and thus it is an aban number.