81452761 has 12 divisors (see below), whose sum is σ = 88517100. Its totient is φ = 74917440.

The previous prime is 81452741. The next prime is 81452801. The reversal of 81452761 is 16725418.

It can be written as a sum of positive squares in 6 ways, for example, as 6734025 + 74718736 = 2595^2 + 8644^2 .

It is not a de Polignac number, because 81452761 - 2⁷ = 81452633 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81452731) 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, 58291 + ... + 59671.

It is an arithmetic number, because the mean of its divisors is an integer number (7376425).

Almost surely, 2^81452761 is an apocalyptic number.

It is an amenable number.

81452761 is a deficient number, since it is larger than the sum of its proper divisors (7064339).

81452761 is a wasteful number, since it uses less digits than its factorization.

81452761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1756 (or 1743 counting only the distinct ones).

The product of its digits is 13440, while the sum is 34.

The square root of 81452761 is about 9025.1183371743. The cubic root of 81452761 is about 433.4795395535.

The spelling of 81452761 in words is "eighty-one million, four hundred fifty-two thousand, seven hundred sixty-one".