81410851 has 2 divisors, whose sum is σ = 81410852. Its totient is φ = 81410850.

The previous prime is 81410837. The next prime is 81410887. The reversal of 81410851 is 15801418.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81410851 is a prime.

It is not a weakly prime, because it can be changed into another prime (81411851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40705425 + 40705426.

It is an arithmetic number, because the mean of its divisors is an integer number (40705426).

Almost surely, 2^81410851 is an apocalyptic number.

81410851 is a deficient number, since it is larger than the sum of its proper divisors (1).

81410851 is an equidigital number, since it uses as much as digits as its factorization.

81410851 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1280, while the sum is 28.

The square root of 81410851 is about 9022.7961852189. The cubic root of 81410851 is about 433.4051805262.

The spelling of 81410851 in words is "eighty-one million, four hundred ten thousand, eight hundred fifty-one".