19913481197 has 2 divisors, whose sum is σ = 19913481198. Its totient is φ = 19913481196.

The previous prime is 19913481169. The next prime is 19913481223. The reversal of 19913481197 is 79118431991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14686046596 + 5227434601 = 121186^2 + 72301^2 .

It is a cyclic number.

It is not a de Polignac number, because 19913481197 - 2¹⁶ = 19913415661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19913484197) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9956740598 + 9956740599.

It is an arithmetic number, because the mean of its divisors is an integer number (9956740599).

Almost surely, 2^19913481197 is an apocalyptic number.

It is an amenable number.

19913481197 is a deficient number, since it is larger than the sum of its proper divisors (1).

19913481197 is an equidigital number, since it uses as much as digits as its factorization.

19913481197 is an evil number, because the sum of its binary digits is even.

The product of its digits is 489888, while the sum is 53.

The spelling of 19913481197 in words is "nineteen billion, nine hundred thirteen million, four hundred eighty-one thousand, one hundred ninety-seven".