81022888091 has 2 divisors, whose sum is σ = 81022888092. Its totient is φ = 81022888090.

The previous prime is 81022888069. The next prime is 81022888103. The reversal of 81022888091 is 19088822018.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81022888091 - 2¹⁸ = 81022625947 is a prime.

It is not a weakly prime, because it can be changed into another prime (81022888021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40511444045 + 40511444046.

It is an arithmetic number, because the mean of its divisors is an integer number (40511444046).

Almost surely, 2^81022888091 is an apocalyptic number.

81022888091 is a deficient number, since it is larger than the sum of its proper divisors (1).

81022888091 is an equidigital number, since it uses as much as digits as its factorization.

81022888091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 147456, while the sum is 47.

The spelling of 81022888091 in words is "eighty-one billion, twenty-two million, eight hundred eighty-eight thousand, ninety-one".