81456107 has 4 divisors (see below), whose sum is σ = 81623856. Its totient is φ = 81288360.

The previous prime is 81456103. The next prime is 81456119. The reversal of 81456107 is 70165418.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 81456107 - 2² = 81456103 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81456103) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 83144 + ... + 84117.

It is an arithmetic number, because the mean of its divisors is an integer number (20405964).

Almost surely, 2^81456107 is an apocalyptic number.

81456107 is a deficient number, since it is larger than the sum of its proper divisors (167749).

81456107 is a wasteful number, since it uses less digits than its factorization.

81456107 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167748.

The product of its (nonzero) digits is 6720, while the sum is 32.

The square root of 81456107 is about 9025.3037068012. The cubic root of 81456107 is about 433.4854751112.

The spelling of 81456107 in words is "eighty-one million, four hundred fifty-six thousand, one hundred seven".