81525411 has 12 divisors (see below), whose sum is σ = 128464440. Its totient is φ = 49409280.

The previous prime is 81525407. The next prime is 81525413. The reversal of 81525411 is 11452518.

It is not a de Polignac number, because 81525411 - 2² = 81525407 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81525413) 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 11 ways as a sum of consecutive naturals, for example, 411646 + ... + 411843.

It is an arithmetic number, because the mean of its divisors is an integer number (10705370).

Almost surely, 2^81525411 is an apocalyptic number.

81525411 is a deficient number, since it is larger than the sum of its proper divisors (46939029).

81525411 is a wasteful number, since it uses less digits than its factorization.

81525411 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 823506 (or 823503 counting only the distinct ones).

The product of its digits is 1600, while the sum is 27.

The square root of 81525411 is about 9029.1423180721. The cubic root of 81525411 is about 433.6083787721.

Adding to 81525411 its reverse (11452518), we get a palindrome (92977929).

The spelling of 81525411 in words is "eighty-one million, five hundred twenty-five thousand, four hundred eleven".