19991149357 has 2 divisors, whose sum is σ = 19991149358. Its totient is φ = 19991149356.

The previous prime is 19991149349. The next prime is 19991149379. The reversal of 19991149357 is 75394119991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19932074761 + 59074596 = 141181^2 + 7686^2 .

It is a cyclic number.

It is not a de Polignac number, because 19991149357 - 2³ = 19991149349 is a prime.

It is a super-2 number, since 2×19991149357² (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 (19991149457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9995574678 + 9995574679.

It is an arithmetic number, because the mean of its divisors is an integer number (9995574679).

Almost surely, 2^19991149357 is an apocalyptic number.

It is an amenable number.

19991149357 is a deficient number, since it is larger than the sum of its proper divisors (1).

19991149357 is an equidigital number, since it uses as much as digits as its factorization.

19991149357 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2755620, while the sum is 58.

The spelling of 19991149357 in words is "nineteen billion, nine hundred ninety-one million, one hundred forty-nine thousand, three hundred fifty-seven".