81522069 has 4 divisors (see below), whose sum is σ = 108696096. Its totient is φ = 54348044.

The previous prime is 81522043. The next prime is 81522071. The reversal of 81522069 is 96022518.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 81522069 - 2²³ = 73133461 is a prime.

It is a super-2 number, since 2×81522069² = 13291695468081522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81522029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13587009 + ... + 13587014.

It is an arithmetic number, because the mean of its divisors is an integer number (27174024).

Almost surely, 2^81522069 is an apocalyptic number.

It is an amenable number.

81522069 is a deficient number, since it is larger than the sum of its proper divisors (27174027).

81522069 is a wasteful number, since it uses less digits than its factorization.

81522069 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27174026.

The product of its (nonzero) digits is 8640, while the sum is 33.

The square root of 81522069 is about 9028.9572487636. The cubic root of 81522069 is about 433.6024536706.

The spelling of 81522069 in words is "eighty-one million, five hundred twenty-two thousand, sixty-nine".