81225385 has 8 divisors (see below), whose sum is σ = 97729920. Its totient is φ = 64807344.

The previous prime is 81225341. The next prime is 81225407. The reversal of 81225385 is 58352218.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81225385 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 81225385.

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, 19537 + ... + 23326.

It is an arithmetic number, because the mean of its divisors is an integer number (12216240).

Almost surely, 2^81225385 is an apocalyptic number.

It is an amenable number.

81225385 is a deficient number, since it is larger than the sum of its proper divisors (16504535).

81225385 is a wasteful number, since it uses less digits than its factorization.

81225385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43247.

The product of its digits is 19200, while the sum is 34.

The square root of 81225385 is about 9012.5126906984. The cubic root of 81225385 is about 433.0758098414.

The spelling of 81225385 in words is "eighty-one million, two hundred twenty-five thousand, three hundred eighty-five".