81527266 has 4 divisors (see below), whose sum is σ = 122290902. Its totient is φ = 40763632.

The previous prime is 81527263. The next prime is 81527273. The reversal of 81527266 is 66272518.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 49999041 + 31528225 = 7071^2 + 5615^2 .

It is not an unprimeable number, because it can be changed into a prime (81527263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20381815 + ... + 20381818.

Almost surely, 2^81527266 is an apocalyptic number.

81527266 is a deficient number, since it is larger than the sum of its proper divisors (40763636).

81527266 is a wasteful number, since it uses less digits than its factorization.

81527266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40763635.

The product of its digits is 40320, while the sum is 37.

The square root of 81527266 is about 9029.2450404228. The cubic root of 81527266 is about 433.6116674704.

The spelling of 81527266 in words is "eighty-one million, five hundred twenty-seven thousand, two hundred sixty-six".