19159297981 has 2 divisors, whose sum is σ = 19159297982. Its totient is φ = 19159297980.

The previous prime is 19159297933. The next prime is 19159298009. The reversal of 19159297981 is 18979295191.

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., 13541045956 + 5618252025 = 116366^2 + 74955^2 .

It is a cyclic number.

It is not a de Polignac number, because 19159297981 - 2⁷ = 19159297853 is a prime.

It is a super-2 number, since 2×19159297981² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19159297901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9579648990 + 9579648991.

It is an arithmetic number, because the mean of its divisors is an integer number (9579648991).

Almost surely, 2^19159297981 is an apocalyptic number.

It is an amenable number.

19159297981 is a deficient number, since it is larger than the sum of its proper divisors (1).

19159297981 is an equidigital number, since it uses as much as digits as its factorization.

19159297981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3674160, while the sum is 61.

The spelling of 19159297981 in words is "nineteen billion, one hundred fifty-nine million, two hundred ninety-seven thousand, nine hundred eighty-one".