81224956 has 24 divisors (see below), whose sum is σ = 144527040. Its totient is φ = 39936000.

The previous prime is 81224921. The next prime is 81224993. The reversal of 81224956 is 65942218.

It is a congruent number.

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, 126396 + ... + 127036.

It is an arithmetic number, because the mean of its divisors is an integer number (6021960).

Almost surely, 2^81224956 is an apocalyptic number.

It is an amenable number.

81224956 is a deficient number, since it is larger than the sum of its proper divisors (63302084).

81224956 is a wasteful number, since it uses less digits than its factorization.

81224956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1125 (or 1123 counting only the distinct ones).

The product of its digits is 34560, while the sum is 37.

The square root of 81224956 is about 9012.4888904231. The cubic root of 81224956 is about 433.0750473956.

The spelling of 81224956 in words is "eighty-one million, two hundred twenty-four thousand, nine hundred fifty-six".