81525894 has 8 divisors (see below), whose sum is σ = 163051800. Its totient is φ = 27175296.

The previous prime is 81525841. The next prime is 81525907. The reversal of 81525894 is 49852518.

It is a happy number.

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

81525894 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6793819 + ... + 6793830.

It is an arithmetic number, because the mean of its divisors is an integer number (20381475).

Almost surely, 2^81525894 is an apocalyptic number.

81525894 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81525894 is a wasteful number, since it uses less digits than its factorization.

81525894 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13587654.

The product of its digits is 115200, while the sum is 42.

The square root of 81525894 is about 9029.1690647589. The cubic root of 81525894 is about 433.6092350795.

The spelling of 81525894 in words is "eighty-one million, five hundred twenty-five thousand, eight hundred ninety-four".