19942835191 has 2 divisors, whose sum is σ = 19942835192. Its totient is φ = 19942835190.

The previous prime is 19942835161. The next prime is 19942835249. The reversal of 19942835191 is 19153824991.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 19942835191 - 2¹³ = 19942826999 is a prime.

It is a super-3 number, since 3×19942835191³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19942835141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9971417595 + 9971417596.

It is an arithmetic number, because the mean of its divisors is an integer number (9971417596).

Almost surely, 2^19942835191 is an apocalyptic number.

19942835191 is a deficient number, since it is larger than the sum of its proper divisors (1).

19942835191 is an equidigital number, since it uses as much as digits as its factorization.

19942835191 is an evil number, because the sum of its binary digits is even.

The product of its digits is 699840, while the sum is 52.

The spelling of 19942835191 in words is "nineteen billion, nine hundred forty-two million, eight hundred thirty-five thousand, one hundred ninety-one".