99999199919 has 2 divisors, whose sum is σ = 99999199920. Its totient is φ = 99999199918.

The previous prime is 99999199913. The next prime is 99999199931. The reversal of 99999199919 is 91999199999.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 99999199919 - 2¹² = 99999195823 is a prime.

It is a super-2 number, since 2×99999199919² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99999199913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49999599959 + 49999599960.

It is an arithmetic number, because the mean of its divisors is an integer number (49999599960).

Almost surely, 2^99999199919 is an apocalyptic number.

99999199919 is a deficient number, since it is larger than the sum of its proper divisors (1).

99999199919 is an equidigital number, since it uses as much as digits as its factorization.

99999199919 is an evil number, because the sum of its binary digits is even.

The product of its digits is 387420489, while the sum is 83.

The spelling of 99999199919 in words is "ninety-nine billion, nine hundred ninety-nine million, one hundred ninety-nine thousand, nine hundred nineteen".