81254511 has 12 divisors (see below), whose sum is σ = 126396088. Its totient is φ = 50002704.

The previous prime is 81254483. The next prime is 81254527. The reversal of 81254511 is 11545218.

It is not a de Polignac number, because 81254511 - 2⁶ = 81254447 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81254531) 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, 347125 + ... + 347358.

Almost surely, 2^81254511 is an apocalyptic number.

81254511 is a deficient number, since it is larger than the sum of its proper divisors (45141577).

81254511 is a wasteful number, since it uses less digits than its factorization.

81254511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 694502 (or 694499 counting only the distinct ones).

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

The square root of 81254511 is about 9014.1284104455. The cubic root of 81254511 is about 433.1275681213.

Adding to 81254511 its reverse (11545218), we get a palindrome (92799729).

The spelling of 81254511 in words is "eighty-one million, two hundred fifty-four thousand, five hundred eleven".