81225316 has 24 divisors (see below), whose sum is σ = 144789120. Its totient is φ = 39864000.

The previous prime is 81225299. The next prime is 81225329. The reversal of 81225316 is 61352218.

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, 53001 + ... + 54511.

It is an arithmetic number, because the mean of its divisors is an integer number (6032880).

Almost surely, 2^81225316 is an apocalyptic number.

It is an amenable number.

81225316 is a deficient number, since it is larger than the sum of its proper divisors (63563804).

81225316 is a wasteful number, since it uses less digits than its factorization.

81225316 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1755 (or 1753 counting only the distinct ones).

The product of its digits is 2880, while the sum is 28.

The square root of 81225316 is about 9012.5088626863. The cubic root of 81225316 is about 433.0756872104.

The spelling of 81225316 in words is "eighty-one million, two hundred twenty-five thousand, three hundred sixteen".