81130527 has 12 divisors (see below), whose sum is σ = 118084824. Its totient is φ = 53673360.

The previous prime is 81130519. The next prime is 81130541. The reversal of 81130527 is 72503118.

81130527 is a `hidden beast` number, since 8 + 1 + 130 + 527 = 666.

It is not a de Polignac number, because 81130527 - 2³ = 81130519 is a prime.

It is a super-2 number, since 2×81130527² = 13164324822595458, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 81130527.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81130327) 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, 33228 + ... + 35585.

It is an arithmetic number, because the mean of its divisors is an integer number (9840402).

Almost surely, 2^81130527 is an apocalyptic number.

81130527 is a deficient number, since it is larger than the sum of its proper divisors (36954297).

81130527 is a wasteful number, since it uses less digits than its factorization.

81130527 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68950 (or 68947 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 27.

The square root of 81130527 is about 9007.2485810041. The cubic root of 81130527 is about 432.9071568707.

The spelling of 81130527 in words is "eighty-one million, one hundred thirty thousand, five hundred twenty-seven".