81122653 has 2 divisors, whose sum is σ = 81122654. Its totient is φ = 81122652.

The previous prime is 81122627. The next prime is 81122659. The reversal of 81122653 is 35622118.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 81054009 + 68644 = 9003^2 + 262^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81122653 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81122659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40561326 + 40561327.

It is an arithmetic number, because the mean of its divisors is an integer number (40561327).

Almost surely, 2^81122653 is an apocalyptic number.

It is an amenable number.

81122653 is a deficient number, since it is larger than the sum of its proper divisors (1).

81122653 is an equidigital number, since it uses as much as digits as its factorization.

81122653 is an evil number, because the sum of its binary digits is even.

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

The square root of 81122653 is about 9006.8114779871. The cubic root of 81122653 is about 432.8931513689.

The spelling of 81122653 in words is "eighty-one million, one hundred twenty-two thousand, six hundred fifty-three".