81527211 has 12 divisors (see below), whose sum is σ = 117839800. Its totient is φ = 54315360.

The previous prime is 81527177. The next prime is 81527263. The reversal of 81527211 is 11272518.

It is not a de Polignac number, because 81527211 - 2¹¹ = 81525163 is a prime.

It is a super-2 number, since 2×81527211² = 13293372266877042, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81525211) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 25215 + ... + 28263.

Almost surely, 2^81527211 is an apocalyptic number.

81527211 is a deficient number, since it is larger than the sum of its proper divisors (36312589).

81527211 is a wasteful number, since it uses less digits than its factorization.

81527211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6026 (or 6023 counting only the distinct ones).

The product of its digits is 1120, while the sum is 27.

The square root of 81527211 is about 9029.2419947635. The cubic root of 81527211 is about 433.6115699625.

Adding to 81527211 its reverse (11272518), we get a palindrome (92799729).

The spelling of 81527211 in words is "eighty-one million, five hundred twenty-seven thousand, two hundred eleven".