81793017 has 16 divisors (see below), whose sum is σ = 121322880. Its totient is φ = 54462096.

The previous prime is 81793007. The next prime is 81793027. The reversal of 81793017 is 71039718.

It is an interprime number because it is at equal distance from previous prime (81793007) and next prime (81793027).

It is not a de Polignac number, because 81793017 - 2⁷ = 81792889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81793007) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31783 + ... + 34259.

It is an arithmetic number, because the mean of its divisors is an integer number (7582680).

Almost surely, 2^81793017 is an apocalyptic number.

It is an amenable number.

81793017 is a deficient number, since it is larger than the sum of its proper divisors (39529863).

81793017 is a wasteful number, since it uses less digits than its factorization.

81793017 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3709 (or 3703 counting only the distinct ones).

The product of its (nonzero) digits is 10584, while the sum is 36.

The square root of 81793017 is about 9043.9491926923. The cubic root of 81793017 is about 434.0822983800.

The spelling of 81793017 in words is "eighty-one million, seven hundred ninety-three thousand, seventeen".