81368479 has 2 divisors, whose sum is σ = 81368480. Its totient is φ = 81368478.

The previous prime is 81368467. The next prime is 81368491. The reversal of 81368479 is 97486318.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (81368467) and next prime (81368491).

It is a cyclic number.

It is not a de Polignac number, because 81368479 - 2¹³ = 81360287 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81368429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40684239 + 40684240.

It is an arithmetic number, because the mean of its divisors is an integer number (40684240).

Almost surely, 2^81368479 is an apocalyptic number.

81368479 is a deficient number, since it is larger than the sum of its proper divisors (1).

81368479 is an equidigital number, since it uses as much as digits as its factorization.

81368479 is an evil number, because the sum of its binary digits is even.

The product of its digits is 290304, while the sum is 46.

The square root of 81368479 is about 9020.4478270206. The cubic root of 81368479 is about 433.3299758451.

The spelling of 81368479 in words is "eighty-one million, three hundred sixty-eight thousand, four hundred seventy-nine".