19371922861 has 2 divisors, whose sum is σ = 19371922862. Its totient is φ = 19371922860.

The previous prime is 19371922813. The next prime is 19371922883. The reversal of 19371922861 is 16822917391.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18243634761 + 1128288100 = 135069^2 + 33590^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19371922861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19371922061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9685961430 + 9685961431.

It is an arithmetic number, because the mean of its divisors is an integer number (9685961431).

Almost surely, 2^19371922861 is an apocalyptic number.

It is an amenable number.

19371922861 is a deficient number, since it is larger than the sum of its proper divisors (1).

19371922861 is an equidigital number, since it uses as much as digits as its factorization.

19371922861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 326592, while the sum is 49.

The spelling of 19371922861 in words is "nineteen billion, three hundred seventy-one million, nine hundred twenty-two thousand, eight hundred sixty-one".