81023317 has 2 divisors, whose sum is σ = 81023318. Its totient is φ = 81023316.

The previous prime is 81023291. The next prime is 81023321. The reversal of 81023317 is 71332018.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 78694641 + 2328676 = 8871^2 + 1526^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81023317 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 81023291 and 81023300.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81023387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40511658 + 40511659.

It is an arithmetic number, because the mean of its divisors is an integer number (40511659).

Almost surely, 2^81023317 is an apocalyptic number.

It is an amenable number.

81023317 is a deficient number, since it is larger than the sum of its proper divisors (1).

81023317 is an equidigital number, since it uses as much as digits as its factorization.

81023317 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 81023317 is about 9001.2952956783. The cubic root of 81023317 is about 432.7163843106.

The spelling of 81023317 in words is "eighty-one million, twenty-three thousand, three hundred seventeen".