81260277 has 12 divisors (see below), whose sum is σ = 126036576. Its totient is φ = 46434360.

The previous prime is 81260273. The next prime is 81260297. The reversal of 81260277 is 77206218.

It is not a de Polignac number, because 81260277 - 2² = 81260273 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81260273) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 276249 + ... + 276542.

It is an arithmetic number, because the mean of its divisors is an integer number (10503048).

Almost surely, 2^81260277 is an apocalyptic number.

It is an amenable number.

81260277 is a deficient number, since it is larger than the sum of its proper divisors (44776299).

81260277 is a wasteful number, since it uses less digits than its factorization.

81260277 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 552808 (or 552801 counting only the distinct ones).

The product of its (nonzero) digits is 9408, while the sum is 33.

The square root of 81260277 is about 9014.4482360264. The cubic root of 81260277 is about 433.1378131094.

The spelling of 81260277 in words is "eighty-one million, two hundred sixty thousand, two hundred seventy-seven".