19772254091 has 2 divisors, whose sum is σ = 19772254092. Its totient is φ = 19772254090.

The previous prime is 19772254081. The next prime is 19772254097. The reversal of 19772254091 is 19045227791.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 19772254091 - 2¹⁸ = 19771991947 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (19772254097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9886127045 + 9886127046.

It is an arithmetic number, because the mean of its divisors is an integer number (9886127046).

Almost surely, 2^19772254091 is an apocalyptic number.

19772254091 is a deficient number, since it is larger than the sum of its proper divisors (1).

19772254091 is an equidigital number, since it uses as much as digits as its factorization.

19772254091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 317520, while the sum is 47.

The spelling of 19772254091 in words is "nineteen billion, seven hundred seventy-two million, two hundred fifty-four thousand, ninety-one".