19290743861 has 2 divisors, whose sum is σ = 19290743862. Its totient is φ = 19290743860.

The previous prime is 19290743753. The next prime is 19290743881. The reversal of 19290743861 is 16834709291.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18008029636 + 1282714225 = 134194^2 + 35815^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19290743861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19290743881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9645371930 + 9645371931.

It is an arithmetic number, because the mean of its divisors is an integer number (9645371931).

Almost surely, 2^19290743861 is an apocalyptic number.

It is an amenable number.

19290743861 is a deficient number, since it is larger than the sum of its proper divisors (1).

19290743861 is an equidigital number, since it uses as much as digits as its factorization.

19290743861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 653184, while the sum is 50.

The spelling of 19290743861 in words is "nineteen billion, two hundred ninety million, seven hundred forty-three thousand, eight hundred sixty-one".