81224607 has 4 divisors (see below), whose sum is σ = 108299480. Its totient is φ = 54149736.

The previous prime is 81224603. The next prime is 81224609. The reversal of 81224607 is 70642218.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 81224607 - 2² = 81224603 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81224603) 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, 13537432 + ... + 13537437.

It is an arithmetic number, because the mean of its divisors is an integer number (27074870).

Almost surely, 2^81224607 is an apocalyptic number.

81224607 is a deficient number, since it is larger than the sum of its proper divisors (27074873).

81224607 is a wasteful number, since it uses less digits than its factorization.

81224607 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27074872.

The product of its (nonzero) digits is 5376, while the sum is 30.

The square root of 81224607 is about 9012.4695283812. The cubic root of 81224607 is about 433.0744271289.

The spelling of 81224607 in words is "eighty-one million, two hundred twenty-four thousand, six hundred seven".