81126733 has 2 divisors, whose sum is σ = 81126734. Its totient is φ = 81126732.

The previous prime is 81126709. The next prime is 81126779. The reversal of 81126733 is 33762118.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 56505289 + 24621444 = 7517^2 + 4962^2 .

It is a cyclic number.

It is not a de Polignac number, because 81126733 - 2⁵ = 81126701 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 81126695 and 81126704.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81120733) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40563366 + 40563367.

It is an arithmetic number, because the mean of its divisors is an integer number (40563367).

Almost surely, 2^81126733 is an apocalyptic number.

It is an amenable number.

81126733 is a deficient number, since it is larger than the sum of its proper divisors (1).

81126733 is an equidigital number, since it uses as much as digits as its factorization.

81126733 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6048, while the sum is 31.

The square root of 81126733 is about 9007.0379703874. The cubic root of 81126733 is about 432.9004085874.

The spelling of 81126733 in words is "eighty-one million, one hundred twenty-six thousand, seven hundred thirty-three".