81417011 has 4 divisors (see below), whose sum is σ = 87679872. Its totient is φ = 75154152.

The previous prime is 81416999. The next prime is 81417041. The reversal of 81417011 is 11071418.

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 81417011 - 2⁶ = 81416947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81417041) 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, 3131411 + ... + 3131436.

It is an arithmetic number, because the mean of its divisors is an integer number (21919968).

Almost surely, 2^81417011 is an apocalyptic number.

81417011 is a deficient number, since it is larger than the sum of its proper divisors (6262861).

81417011 is a wasteful number, since it uses less digits than its factorization.

81417011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6262860.

The product of its (nonzero) digits is 224, while the sum is 23.

The square root of 81417011 is about 9023.1375363562. The cubic root of 81417011 is about 433.4161115366.

Adding to 81417011 its reverse (11071418), we get a palindrome (92488429).

The spelling of 81417011 in words is "eighty-one million, four hundred seventeen thousand, eleven".