81445277 has 8 divisors (see below), whose sum is σ = 87728640. Its totient is φ = 75390480.

The previous prime is 81445261. The next prime is 81445279. The reversal of 81445277 is 77254418.

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

It is a cyclic number.

It is not a de Polignac number, because 81445277 - 2⁴ = 81445261 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 81445277.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81445279) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 56402 + ... + 57827.

It is an arithmetic number, because the mean of its divisors is an integer number (10966080).

Almost surely, 2^81445277 is an apocalyptic number.

It is an amenable number.

81445277 is a deficient number, since it is larger than the sum of its proper divisors (6283363).

81445277 is a wasteful number, since it uses less digits than its factorization.

81445277 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114283.

The product of its digits is 62720, while the sum is 38.

The square root of 81445277 is about 9024.7037070477. The cubic root of 81445277 is about 433.4662629001.

The spelling of 81445277 in words is "eighty-one million, four hundred forty-five thousand, two hundred seventy-seven".