19238974861 has 2 divisors, whose sum is σ = 19238974862. Its totient is φ = 19238974860.

The previous prime is 19238974823. The next prime is 19238974907. The reversal of 19238974861 is 16847983291.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11245542025 + 7993432836 = 106045^2 + 89406^2 .

It is a cyclic number.

It is not a de Polignac number, because 19238974861 - 2¹¹ = 19238972813 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 19238974796 and 19238974805.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19238984861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9619487430 + 9619487431.

It is an arithmetic number, because the mean of its divisors is an integer number (9619487431).

Almost surely, 2^19238974861 is an apocalyptic number.

It is an amenable number.

19238974861 is a deficient number, since it is larger than the sum of its proper divisors (1).

19238974861 is an equidigital number, since it uses as much as digits as its factorization.

19238974861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5225472, while the sum is 58.

The spelling of 19238974861 in words is "nineteen billion, two hundred thirty-eight million, nine hundred seventy-four thousand, eight hundred sixty-one".