81000793 has 2 divisors, whose sum is σ = 81000794. Its totient is φ = 81000792.

The previous prime is 81000757. The next prime is 81000809. The reversal of 81000793 is 39700018.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 57108249 + 23892544 = 7557^2 + 4888^2 .

It is a cyclic number.

It is not a de Polignac number, because 81000793 - 2¹³ = 80992601 is a prime.

It is a super-2 number, since 2×81000793² = 13122256933257698, which contains 22 as substring.

It is equal to p_4724461 and since 81000793 and 4724461 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (81000713) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40500396 + 40500397.

It is an arithmetic number, because the mean of its divisors is an integer number (40500397).

Almost surely, 2^81000793 is an apocalyptic number.

It is an amenable number.

81000793 is a deficient number, since it is larger than the sum of its proper divisors (1).

81000793 is an equidigital number, since it uses as much as digits as its factorization.

81000793 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1512, while the sum is 28.

The square root of 81000793 is about 9000.0440554477. The cubic root of 81000793 is about 432.6762830677.

The spelling of 81000793 in words is "eighty-one million, seven hundred ninety-three", and thus it is an aban number.