81122365 has 4 divisors (see below), whose sum is σ = 97346844. Its totient is φ = 64897888.

The previous prime is 81122347. The next prime is 81122369. The reversal of 81122365 is 56322118.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 63457156 + 17665209 = 7966^2 + 4203^2 .

It is a cyclic number.

It is not a de Polignac number, because 81122365 - 2⁵ = 81122333 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81122369) 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, 8112232 + ... + 8112241.

It is an arithmetic number, because the mean of its divisors is an integer number (24336711).

Almost surely, 2^81122365 is an apocalyptic number.

It is an amenable number.

81122365 is a deficient number, since it is larger than the sum of its proper divisors (16224479).

81122365 is a wasteful number, since it uses less digits than its factorization.

81122365 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16224478.

The product of its digits is 2880, while the sum is 28.

The square root of 81122365 is about 9006.7954900730. The cubic root of 81122365 is about 432.8926390855.

The spelling of 81122365 in words is "eighty-one million, one hundred twenty-two thousand, three hundred sixty-five".