81826653 has 4 divisors (see below), whose sum is σ = 109102208. Its totient is φ = 54551100.

The previous prime is 81826621. The next prime is 81826733. The reversal of 81826653 is 35662818.

It is a happy number.

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 not a de Polignac number, because 81826653 - 2⁵ = 81826621 is a prime.

It is a super-2 number, since 2×81826653² = 13391202282364818, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81826153) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13637773 + ... + 13637778.

It is an arithmetic number, because the mean of its divisors is an integer number (27275552).

Almost surely, 2^81826653 is an apocalyptic number.

It is an amenable number.

81826653 is a deficient number, since it is larger than the sum of its proper divisors (27275555).

81826653 is a wasteful number, since it uses less digits than its factorization.

81826653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27275554.

The product of its digits is 69120, while the sum is 39.

The square root of 81826653 is about 9045.8085874067. The cubic root of 81826653 is about 434.1417932355.

The spelling of 81826653 in words is "eighty-one million, eight hundred twenty-six thousand, six hundred fifty-three".