19131794977 has 2 divisors, whose sum is σ = 19131794978. Its totient is φ = 19131794976.

The previous prime is 19131794923. The next prime is 19131795037. The reversal of 19131794977 is 77949713191.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12693176896 + 6438618081 = 112664^2 + 80241^2 .

It is a cyclic number.

It is not a de Polignac number, because 19131794977 - 2¹⁹ = 19131270689 is a prime.

It is not a weakly prime, because it can be changed into another prime (19131791977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9565897488 + 9565897489.

It is an arithmetic number, because the mean of its divisors is an integer number (9565897489).

Almost surely, 2^19131794977 is an apocalyptic number.

It is an amenable number.

19131794977 is a deficient number, since it is larger than the sum of its proper divisors (1).

19131794977 is an equidigital number, since it uses as much as digits as its factorization.

19131794977 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3000564, while the sum is 58.

The spelling of 19131794977 in words is "nineteen billion, one hundred thirty-one million, seven hundred ninety-four thousand, nine hundred seventy-seven".