81258299 has 2 divisors, whose sum is σ = 81258300. Its totient is φ = 81258298.

The previous prime is 81258277. The next prime is 81258311. The reversal of 81258299 is 99285218.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81258299 - 2²⁴ = 64481083 is a prime.

It is a super-2 number, since 2×81258299² = 13205822312746802, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (81258209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40629149 + 40629150.

It is an arithmetic number, because the mean of its divisors is an integer number (40629150).

Almost surely, 2^81258299 is an apocalyptic number.

81258299 is a deficient number, since it is larger than the sum of its proper divisors (1).

81258299 is an equidigital number, since it uses as much as digits as its factorization.

81258299 is an evil number, because the sum of its binary digits is even.

The product of its digits is 103680, while the sum is 44.

The square root of 81258299 is about 9014.3385225983. The cubic root of 81258299 is about 433.1342986676.

The spelling of 81258299 in words is "eighty-one million, two hundred fifty-eight thousand, two hundred ninety-nine".