81344407 has 2 divisors, whose sum is σ = 81344408. Its totient is φ = 81344406.

The previous prime is 81344401. The next prime is 81344413. The reversal of 81344407 is 70444318.

It is a balanced prime because it is at equal distance from previous prime (81344401) and next prime (81344413).

It is a cyclic number.

It is not a de Polignac number, because 81344407 - 2¹⁵ = 81311639 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 (81344401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40672203 + 40672204.

It is an arithmetic number, because the mean of its divisors is an integer number (40672204).

Almost surely, 2^81344407 is an apocalyptic number.

81344407 is a deficient number, since it is larger than the sum of its proper divisors (1).

81344407 is an equidigital number, since it uses as much as digits as its factorization.

81344407 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10752, while the sum is 31.

The square root of 81344407 is about 9019.1134264960. The cubic root of 81344407 is about 433.2872396074.

The spelling of 81344407 in words is "eighty-one million, three hundred forty-four thousand, four hundred seven".