81311059 has 2 divisors, whose sum is σ = 81311060. Its totient is φ = 81311058.

The previous prime is 81311011. The next prime is 81311107. The reversal of 81311059 is 95011318.

It is a balanced prime because it is at equal distance from previous prime (81311011) and next prime (81311107).

It is a cyclic number.

It is not a de Polignac number, because 81311059 - 2⁹ = 81310547 is a prime.

It is a super-2 number, since 2×81311059² = 13222976631402962, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (81311359) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40655529 + 40655530.

It is an arithmetic number, because the mean of its divisors is an integer number (40655530).

Almost surely, 2^81311059 is an apocalyptic number.

81311059 is a deficient number, since it is larger than the sum of its proper divisors (1).

81311059 is an equidigital number, since it uses as much as digits as its factorization.

81311059 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1080, while the sum is 28.

The square root of 81311059 is about 9017.2644965089. The cubic root of 81311059 is about 433.2280212854.

The spelling of 81311059 in words is "eighty-one million, three hundred eleven thousand, fifty-nine".