19308140981 has 2 divisors, whose sum is σ = 19308140982. Its totient is φ = 19308140980.

The previous prime is 19308140963. The next prime is 19308140987. The reversal of 19308140981 is 18904180391.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14916958225 + 4391182756 = 122135^2 + 66266^2 .

It is a cyclic number.

It is not a de Polignac number, because 19308140981 - 2¹⁰ = 19308139957 is a prime.

It is a super-2 number, since 2×19308140981² (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 (19308140987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9654070490 + 9654070491.

It is an arithmetic number, because the mean of its divisors is an integer number (9654070491).

Almost surely, 2^19308140981 is an apocalyptic number.

It is an amenable number.

19308140981 is a deficient number, since it is larger than the sum of its proper divisors (1).

19308140981 is an equidigital number, since it uses as much as digits as its factorization.

19308140981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 62208, while the sum is 44.

The spelling of 19308140981 in words is "nineteen billion, three hundred eight million, one hundred forty thousand, nine hundred eighty-one".