81230099 has 4 divisors (see below), whose sum is σ = 81463200. Its totient is φ = 80997000.

The previous prime is 81230081. The next prime is 81230117. The reversal of 81230099 is 99003218.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99003218 = 2 ⋅49501609.

It is an interprime number because it is at equal distance from previous prime (81230081) and next prime (81230117).

It is a cyclic number.

It is not a de Polignac number, because 81230099 - 2¹² = 81226003 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81230069) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 116027 + ... + 116724.

It is an arithmetic number, because the mean of its divisors is an integer number (20365800).

Almost surely, 2^81230099 is an apocalyptic number.

81230099 is a deficient number, since it is larger than the sum of its proper divisors (233101).

81230099 is a wasteful number, since it uses less digits than its factorization.

81230099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 233100.

The product of its (nonzero) digits is 3888, while the sum is 32.

The square root of 81230099 is about 9012.7742121946. The cubic root of 81230099 is about 433.0841876815.

The spelling of 81230099 in words is "eighty-one million, two hundred thirty thousand, ninety-nine".