81794231 has 2 divisors, whose sum is σ = 81794232. Its totient is φ = 81794230.

The previous prime is 81794197. The next prime is 81794243. The reversal of 81794231 is 13249718.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81794231 is a prime.

It is a super-2 number, since 2×81794231² = 13380592449762722, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 81794191 and 81794200.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81794261) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40897115 + 40897116.

It is an arithmetic number, because the mean of its divisors is an integer number (40897116).

Almost surely, 2^81794231 is an apocalyptic number.

81794231 is a deficient number, since it is larger than the sum of its proper divisors (1).

81794231 is an equidigital number, since it uses as much as digits as its factorization.

81794231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12096, while the sum is 35.

The square root of 81794231 is about 9044.0163091405. The cubic root of 81794231 is about 434.0844459688.

The spelling of 81794231 in words is "eighty-one million, seven hundred ninety-four thousand, two hundred thirty-one".