81051417 has 6 divisors (see below), whose sum is σ = 117074282. Its totient is φ = 54034272.

The previous prime is 81051413. The next prime is 81051457. The reversal of 81051417 is 71415018.

It can be written as a sum of positive squares in only one way, i.e., 48149721 + 32901696 = 6939^2 + 5736^2 .

It is not a de Polignac number, because 81051417 - 2² = 81051413 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81051413) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4502848 + ... + 4502865.

Almost surely, 2^81051417 is an apocalyptic number.

It is an amenable number.

81051417 is a deficient number, since it is larger than the sum of its proper divisors (36022865).

81051417 is a wasteful number, since it uses less digits than its factorization.

81051417 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9005719 (or 9005716 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 27.

The square root of 81051417 is about 9002.8560468331. The cubic root of 81051417 is about 432.7664025253.

The spelling of 81051417 in words is "eighty-one million, fifty-one thousand, four hundred seventeen".