81266125 has 16 divisors (see below), whose sum is σ = 101836800. Its totient is φ = 64746000.

The previous prime is 81266123. The next prime is 81266131. The reversal of 81266125 is 52166218.

It is not a de Polignac number, because 81266125 - 2¹ = 81266123 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81266123) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32676 + ... + 35074.

It is an arithmetic number, because the mean of its divisors is an integer number (6364800).

Almost surely, 2^81266125 is an apocalyptic number.

It is an amenable number.

81266125 is a deficient number, since it is larger than the sum of its proper divisors (20570675).

81266125 is a wasteful number, since it uses less digits than its factorization.

81266125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2685 (or 2675 counting only the distinct ones).

The product of its digits is 5760, while the sum is 31.

The square root of 81266125 is about 9014.7725983521. The cubic root of 81266125 is about 433.1482032994.

The spelling of 81266125 in words is "eighty-one million, two hundred sixty-six thousand, one hundred twenty-five".