81264527 has 2 divisors, whose sum is σ = 81264528. Its totient is φ = 81264526.

The previous prime is 81264523. The next prime is 81264559. The reversal of 81264527 is 72546218.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81264527 - 2² = 81264523 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81264523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40632263 + 40632264.

It is an arithmetic number, because the mean of its divisors is an integer number (40632264).

Almost surely, 2^81264527 is an apocalyptic number.

81264527 is a deficient number, since it is larger than the sum of its proper divisors (1).

81264527 is an equidigital number, since it uses as much as digits as its factorization.

81264527 is an evil number, because the sum of its binary digits is even.

The product of its digits is 26880, while the sum is 35.

The square root of 81264527 is about 9014.6839656196. The cubic root of 81264527 is about 433.1453641691.

The spelling of 81264527 in words is "eighty-one million, two hundred sixty-four thousand, five hundred twenty-seven".