81414917 has 4 divisors (see below), whose sum is σ = 84954720. Its totient is φ = 77875116.

The previous prime is 81414901. The next prime is 81414923. The reversal of 81414917 is 71941418.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 81414917 - 2⁴ = 81414901 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81414947) 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, 1769867 + ... + 1769912.

It is an arithmetic number, because the mean of its divisors is an integer number (21238680).

Almost surely, 2^81414917 is an apocalyptic number.

It is an amenable number.

81414917 is a deficient number, since it is larger than the sum of its proper divisors (3539803).

81414917 is a wasteful number, since it uses less digits than its factorization.

81414917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3539802.

The product of its digits is 8064, while the sum is 35.

The square root of 81414917 is about 9023.0215005839. The cubic root of 81414917 is about 433.4123957647.

The spelling of 81414917 in words is "eighty-one million, four hundred fourteen thousand, nine hundred seventeen".