99973091 has 2 divisors, whose sum is σ = 99973092. Its totient is φ = 99973090.

The previous prime is 99973061. The next prime is 99973099. The reversal of 99973091 is 19037999.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-99973091 is a prime.

It is not a weakly prime, because it can be changed into another prime (99973099) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49986545 + 49986546.

It is an arithmetic number, because the mean of its divisors is an integer number (49986546).

Almost surely, 2^99973091 is an apocalyptic number.

99973091 is a deficient number, since it is larger than the sum of its proper divisors (1).

99973091 is an equidigital number, since it uses as much as digits as its factorization.

99973091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 137781, while the sum is 47.

The square root of 99973091 is about 9998.6544594760. The cubic root of 99973091 is about 464.1172461217.

The spelling of 99973091 in words is "ninety-nine million, nine hundred seventy-three thousand, ninety-one".