81417516 has 24 divisors (see below), whose sum is σ = 198234624. Its totient is φ = 25959120.

The previous prime is 81417509. The next prime is 81417547. The reversal of 81417516 is 61571418.

It is a happy number.

It is a super-2 number, since 2×81417516² = 13257623823220512, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 147220 + ... + 147771.

It is an arithmetic number, because the mean of its divisors is an integer number (8259776).

Almost surely, 2^81417516 is an apocalyptic number.

It is an amenable number.

81417516 is an abundant number, since it is smaller than the sum of its proper divisors (116817108).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81417516 is a wasteful number, since it uses less digits than its factorization.

81417516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 295021 (or 295019 counting only the distinct ones).

The product of its digits is 6720, while the sum is 33.

The square root of 81417516 is about 9023.1655199270. The cubic root of 81417516 is about 433.4170076420.

The spelling of 81417516 in words is "eighty-one million, four hundred seventeen thousand, five hundred sixteen".