81097527 has 16 divisors (see below), whose sum is σ = 126452480. Its totient is φ = 45263232.

The previous prime is 81097507. The next prime is 81097619. The reversal of 81097527 is 72579018.

It is not a de Polignac number, because 81097527 - 2¹¹ = 81095479 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81097507) 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, 44002 + ... + 45807.

It is an arithmetic number, because the mean of its divisors is an integer number (7903280).

Almost surely, 2^81097527 is an apocalyptic number.

81097527 is a deficient number, since it is larger than the sum of its proper divisors (45354953).

81097527 is a wasteful number, since it uses less digits than its factorization.

81097527 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89862.

The product of its (nonzero) digits is 35280, while the sum is 39.

The square root of 81097527 is about 9005.4165367294. The cubic root of 81097527 is about 432.8484536342.

The spelling of 81097527 in words is "eighty-one million, ninety-seven thousand, five hundred twenty-seven".