99991499 has 2 divisors, whose sum is σ = 99991500. Its totient is φ = 99991498.

The previous prime is 99991481. The next prime is 99991517. The reversal of 99991499 is 99419999.

It is a balanced prime because it is at equal distance from previous prime (99991481) and next prime (99991517).

It is a cyclic number.

It is not a de Polignac number, because 99991499 - 2²⁰ = 98942923 is a prime.

It is not a weakly prime, because it can be changed into another prime (99991999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49995749 + 49995750.

It is an arithmetic number, because the mean of its divisors is an integer number (49995750).

Almost surely, 2^99991499 is an apocalyptic number.

99991499 is a deficient number, since it is larger than the sum of its proper divisors (1).

99991499 is an equidigital number, since it uses as much as digits as its factorization.

99991499 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2125764, while the sum is 59.

The square root of 99991499 is about 9999.5749409662. The cubic root of 99991499 is about 464.1457302730.

The spelling of 99991499 in words is "ninety-nine million, nine hundred ninety-one thousand, four hundred ninety-nine".