81296993 has 2 divisors, whose sum is σ = 81296994. Its totient is φ = 81296992.

The previous prime is 81296989. The next prime is 81297001. The reversal of 81296993 is 39969218.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 65480464 + 15816529 = 8092^2 + 3977^2 .

It is a cyclic number.

It is not a de Polignac number, because 81296993 - 2² = 81296989 is a prime.

It is not a weakly prime, because it can be changed into another prime (81296903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40648496 + 40648497.

It is an arithmetic number, because the mean of its divisors is an integer number (40648497).

Almost surely, 2^81296993 is an apocalyptic number.

It is an amenable number.

81296993 is a deficient number, since it is larger than the sum of its proper divisors (1).

81296993 is an equidigital number, since it uses as much as digits as its factorization.

81296993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 209952, while the sum is 47.

The square root of 81296993 is about 9016.4845144879. The cubic root of 81296993 is about 433.2030384731.

The spelling of 81296993 in words is "eighty-one million, two hundred ninety-six thousand, nine hundred ninety-three".