81063793 has 2 divisors, whose sum is σ = 81063794. Its totient is φ = 81063792.

The previous prime is 81063761. The next prime is 81063809. The reversal of 81063793 is 39736018.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 80496784 + 567009 = 8972^2 + 753^2 .

It is a cyclic number.

It is not a de Polignac number, because 81063793 - 2⁵ = 81063761 is a prime.

It is not a weakly prime, because it can be changed into another prime (81063893) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40531896 + 40531897.

It is an arithmetic number, because the mean of its divisors is an integer number (40531897).

Almost surely, 2^81063793 is an apocalyptic number.

It is an amenable number.

81063793 is a deficient number, since it is larger than the sum of its proper divisors (1).

81063793 is an equidigital number, since it uses as much as digits as its factorization.

81063793 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27216, while the sum is 37.

The square root of 81063793 is about 9003.5433580341. The cubic root of 81063793 is about 432.7884282328.

The spelling of 81063793 in words is "eighty-one million, sixty-three thousand, seven hundred ninety-three".