81369371 has 2 divisors, whose sum is σ = 81369372. Its totient is φ = 81369370.

The previous prime is 81369367. The next prime is 81369391. The reversal of 81369371 is 17396318.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81369371 - 2² = 81369367 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (81369391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40684685 + 40684686.

It is an arithmetic number, because the mean of its divisors is an integer number (40684686).

Almost surely, 2^81369371 is an apocalyptic number.

81369371 is a deficient number, since it is larger than the sum of its proper divisors (1).

81369371 is an equidigital number, since it uses as much as digits as its factorization.

81369371 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27216, while the sum is 38.

The square root of 81369371 is about 9020.4972701066. The cubic root of 81369371 is about 433.3315592958.

The spelling of 81369371 in words is "eighty-one million, three hundred sixty-nine thousand, three hundred seventy-one".