19779359231 has 2 divisors, whose sum is σ = 19779359232. Its totient is φ = 19779359230.

The previous prime is 19779359213. The next prime is 19779359261. The reversal of 19779359231 is 13295397791.

Together with previous prime (19779359213) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 19779359231 - 2²⁶ = 19712250367 is a prime.

It is a super-2 number, since 2×19779359231² (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 (19779359261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9889679615 + 9889679616.

It is an arithmetic number, because the mean of its divisors is an integer number (9889679616).

Almost surely, 2^19779359231 is an apocalyptic number.

19779359231 is a deficient number, since it is larger than the sum of its proper divisors (1).

19779359231 is an equidigital number, since it uses as much as digits as its factorization.

19779359231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3214890, while the sum is 56.

The spelling of 19779359231 in words is "nineteen billion, seven hundred seventy-nine million, three hundred fifty-nine thousand, two hundred thirty-one".