81418527 has 20 divisors (see below), whose sum is σ = 121953480. Its totient is φ = 54132624.

The previous prime is 81418507. The next prime is 81418529. The reversal of 81418527 is 72581418.

It is not a de Polignac number, because 81418527 - 2¹⁰ = 81417503 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a junction number, because it is equal to n+sod(n) for n = 81418491 and 81418500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81418529) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 34749 + ... + 37017.

It is an arithmetic number, because the mean of its divisors is an integer number (6097674).

Almost surely, 2^81418527 is an apocalyptic number.

81418527 is a deficient number, since it is larger than the sum of its proper divisors (40534953).

81418527 is a wasteful number, since it uses less digits than its factorization.

81418527 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2724 (or 2715 counting only the distinct ones).

The product of its digits is 17920, while the sum is 36.

The square root of 81418527 is about 9023.2215422209. The cubic root of 81418527 is about 433.4188016163.

The spelling of 81418527 in words is "eighty-one million, four hundred eighteen thousand, five hundred twenty-seven".