81526207 has 16 divisors (see below), whose sum is σ = 100733440. Its totient is φ = 64408608.

The previous prime is 81526199. The next prime is 81526213. The reversal of 81526207 is 70262518.

It is a cyclic number.

It is not a de Polignac number, because 81526207 - 2³ = 81526199 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81526297) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3363 + ... + 13204.

It is an arithmetic number, because the mean of its divisors is an integer number (6295840).

Almost surely, 2^81526207 is an apocalyptic number.

81526207 is a deficient number, since it is larger than the sum of its proper divisors (19207233).

81526207 is a wasteful number, since it uses less digits than its factorization.

81526207 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16630.

The product of its (nonzero) digits is 6720, while the sum is 31.

The square root of 81526207 is about 9029.1863974558. The cubic root of 81526207 is about 433.6097899932.

The spelling of 81526207 in words is "eighty-one million, five hundred twenty-six thousand, two hundred seven".