81525093 has 24 divisors (see below), whose sum is σ = 118829952. Its totient is φ = 49690368.

The previous prime is 81525089. The next prime is 81525121. The reversal of 81525093 is 39052518.

It is not a de Polignac number, because 81525093 - 2² = 81525089 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81525793) 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 23 ways as a sum of consecutive naturals, for example, 56580 + ... + 58002.

It is an arithmetic number, because the mean of its divisors is an integer number (4951248).

Almost surely, 2^81525093 is an apocalyptic number.

It is an amenable number.

81525093 is a deficient number, since it is larger than the sum of its proper divisors (37304859).

81525093 is a wasteful number, since it uses less digits than its factorization.

81525093 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1565 (or 1552 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 33.

The square root of 81525093 is about 9029.1247084089. The cubic root of 81525093 is about 433.6078149902.

The spelling of 81525093 in words is "eighty-one million, five hundred twenty-five thousand, ninety-three".