99998491 has 2 divisors, whose sum is σ = 99998492. Its totient is φ = 99998490.

The previous prime is 99998473. The next prime is 99998497. The reversal of 99998491 is 19489999.

It is a strong prime.

It is an emirp because it is prime and its reverse (19489999) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 99998491 - 2⁷ = 99998363 is a prime.

It is not a weakly prime, because it can be changed into another prime (99998497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49999245 + 49999246.

It is an arithmetic number, because the mean of its divisors is an integer number (49999246).

Almost surely, 2^99998491 is an apocalyptic number.

99998491 is a deficient number, since it is larger than the sum of its proper divisors (1).

99998491 is an equidigital number, since it uses as much as digits as its factorization.

99998491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1889568, while the sum is 58.

The square root of 99998491 is about 9999.9245497154. The cubic root of 99998491 is about 464.1565486304.

It can be divided in two parts, 99998 and 491, that added together give a square (100489 = 317²).

The spelling of 99998491 in words is "ninety-nine million, nine hundred ninety-eight thousand, four hundred ninety-one".