81826145 has 8 divisors (see below), whose sum is σ = 98842560. Its totient is φ = 65026800.

The previous prime is 81826123. The next prime is 81826153. The reversal of 81826145 is 54162818.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 81826145 - 2⁸ = 81825889 is a prime.

It is a super-2 number, since 2×81826145² = 13391036011122050, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 53435 + ... + 54944.

It is an arithmetic number, because the mean of its divisors is an integer number (12355320).

Almost surely, 2^81826145 is an apocalyptic number.

It is an amenable number.

81826145 is a deficient number, since it is larger than the sum of its proper divisors (17016415).

81826145 is a wasteful number, since it uses less digits than its factorization.

81826145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108535.

The product of its digits is 15360, while the sum is 35.

The square root of 81826145 is about 9045.7805080601. The cubic root of 81826145 is about 434.1408948140.

The spelling of 81826145 in words is "eighty-one million, eight hundred twenty-six thousand, one hundred forty-five".