19955800231 has 2 divisors, whose sum is σ = 19955800232. Its totient is φ = 19955800230.

The previous prime is 19955800213. The next prime is 19955800273. The reversal of 19955800231 is 13200855991.

It is a happy number.

Together with previous prime (19955800213) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is an emirp because it is prime and its reverse (13200855991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19955800231 - 2¹⁵ = 19955767463 is a prime.

It is a super-2 number, since 2×19955800231² (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 (19955800831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9977900115 + 9977900116.

It is an arithmetic number, because the mean of its divisors is an integer number (9977900116).

Almost surely, 2^19955800231 is an apocalyptic number.

19955800231 is a deficient number, since it is larger than the sum of its proper divisors (1).

19955800231 is an equidigital number, since it uses as much as digits as its factorization.

19955800231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 97200, while the sum is 43.

The spelling of 19955800231 in words is "nineteen billion, nine hundred fifty-five million, eight hundred thousand, two hundred thirty-one".