19776794231 has 2 divisors, whose sum is σ = 19776794232. Its totient is φ = 19776794230.

The previous prime is 19776794129. The next prime is 19776794239. The reversal of 19776794231 is 13249767791.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 19776794231 - 2¹⁴ = 19776777847 is a prime.

It is a super-2 number, since 2×19776794231² (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 (19776794239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9888397115 + 9888397116.

It is an arithmetic number, because the mean of its divisors is an integer number (9888397116).

Almost surely, 2^19776794231 is an apocalyptic number.

19776794231 is a deficient number, since it is larger than the sum of its proper divisors (1).

19776794231 is an equidigital number, since it uses as much as digits as its factorization.

19776794231 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4000752, while the sum is 56.

The spelling of 19776794231 in words is "nineteen billion, seven hundred seventy-six million, seven hundred ninety-four thousand, two hundred thirty-one".