19948290991 has 2 divisors, whose sum is σ = 19948290992. Its totient is φ = 19948290990.

The previous prime is 19948290983. The next prime is 19948291019. The reversal of 19948290991 is 19909284991.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 19948290991 - 2³ = 19948290983 is a prime.

It is a super-2 number, since 2×19948290991² (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 (19948290911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9974145495 + 9974145496.

It is an arithmetic number, because the mean of its divisors is an integer number (9974145496).

Almost surely, 2^19948290991 is an apocalyptic number.

19948290991 is a deficient number, since it is larger than the sum of its proper divisors (1).

19948290991 is an equidigital number, since it uses as much as digits as its factorization.

19948290991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3779136, while the sum is 61.

The spelling of 19948290991 in words is "nineteen billion, nine hundred forty-eight million, two hundred ninety thousand, nine hundred ninety-one".