81393371 has 2 divisors, whose sum is σ = 81393372. Its totient is φ = 81393370.

The previous prime is 81393329. The next prime is 81393407. The reversal of 81393371 is 17339318.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81393371 - 2⁶ = 81393307 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (81303371) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40696685 + 40696686.

It is an arithmetic number, because the mean of its divisors is an integer number (40696686).

Almost surely, 2^81393371 is an apocalyptic number.

81393371 is a deficient number, since it is larger than the sum of its proper divisors (1).

81393371 is an equidigital number, since it uses as much as digits as its factorization.

81393371 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13608, while the sum is 35.

The square root of 81393371 is about 9021.8274756282. The cubic root of 81393371 is about 433.3741590070.

The spelling of 81393371 in words is "eighty-one million, three hundred ninety-three thousand, three hundred seventy-one".