81282469 has 4 divisors (see below), whose sum is σ = 81354240. Its totient is φ = 81210700.

The previous prime is 81282463. The next prime is 81282473. The reversal of 81282469 is 96428218.

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 81282469 - 2¹¹ = 81280421 is a prime.

It is a super-2 number, since 2×81282469² = 13213679533471922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81282463) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34159 + ... + 36460.

It is an arithmetic number, because the mean of its divisors is an integer number (20338560).

Almost surely, 2^81282469 is an apocalyptic number.

It is an amenable number.

81282469 is a deficient number, since it is larger than the sum of its proper divisors (71771).

81282469 is a wasteful number, since it uses less digits than its factorization.

81282469 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71770.

The product of its digits is 55296, while the sum is 40.

The square root of 81282469 is about 9015.6790648292. The cubic root of 81282469 is about 433.1772391767.

The spelling of 81282469 in words is "eighty-one million, two hundred eighty-two thousand, four hundred sixty-nine".