81914847 has 8 divisors (see below), whose sum is σ = 124822656. Its totient is φ = 46808472.

The previous prime is 81914831. The next prime is 81914849. The reversal of 81914847 is 74841918.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 81914847 - 2⁴ = 81914831 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 81914799 and 81914808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81914849) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1950333 + ... + 1950374.

It is an arithmetic number, because the mean of its divisors is an integer number (15602832).

Almost surely, 2^81914847 is an apocalyptic number.

81914847 is a deficient number, since it is larger than the sum of its proper divisors (42907809).

81914847 is a wasteful number, since it uses less digits than its factorization.

81914847 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3900717.

The product of its digits is 64512, while the sum is 42.

The square root of 81914847 is about 9050.6821289890. The cubic root of 81914847 is about 434.2977120880.

The spelling of 81914847 in words is "eighty-one million, nine hundred fourteen thousand, eight hundred forty-seven".