81527369 has 16 divisors (see below), whose sum is σ = 102045696. Its totient is φ = 63277200.

The previous prime is 81527363. The next prime is 81527371. The reversal of 81527369 is 96372518.

It is not a de Polignac number, because 81527369 - 2²⁰ = 80478793 is a prime.

It is a super-2 number, since 2×81527369² = 13293423792124322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (81527363) 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, 18914 + ... + 22820.

It is an arithmetic number, because the mean of its divisors is an integer number (6377856).

Almost surely, 2^81527369 is an apocalyptic number.

It is an amenable number.

81527369 is a deficient number, since it is larger than the sum of its proper divisors (20518327).

81527369 is a wasteful number, since it uses less digits than its factorization.

81527369 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4196.

The product of its digits is 90720, while the sum is 41.

The square root of 81527369 is about 9029.2507441094. The cubic root of 81527369 is about 433.6118500759.

The spelling of 81527369 in words is "eighty-one million, five hundred twenty-seven thousand, three hundred sixty-nine".