19900000279 has 2 divisors, whose sum is σ = 19900000280. Its totient is φ = 19900000278.

The previous prime is 19900000247. The next prime is 19900000297. The reversal of 19900000279 is 97200000991.

Together with next prime (19900000297) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 19900000279 - 2⁵ = 19900000247 is a prime.

It is a super-2 number, since 2×19900000279² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19900007279) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9950000139 + 9950000140.

It is an arithmetic number, because the mean of its divisors is an integer number (9950000140).

Almost surely, 2^19900000279 is an apocalyptic number.

19900000279 is a deficient number, since it is larger than the sum of its proper divisors (1).

19900000279 is an equidigital number, since it uses as much as digits as its factorization.

19900000279 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10206, while the sum is 37.

The spelling of 19900000279 in words is "nineteen billion, nine hundred million, two hundred seventy-nine", and thus it is an aban number.