81260687 has 2 divisors, whose sum is σ = 81260688. Its totient is φ = 81260686.

The previous prime is 81260681. The next prime is 81260689. The reversal of 81260687 is 78606218.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81260687 - 2⁴ = 81260671 is a prime.

Together with 81260689, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p_4738871 and since 81260687 and 4738871 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 81260687.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81260681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40630343 + 40630344.

It is an arithmetic number, because the mean of its divisors is an integer number (40630344).

Almost surely, 2^81260687 is an apocalyptic number.

81260687 is a deficient number, since it is larger than the sum of its proper divisors (1).

81260687 is an equidigital number, since it uses as much as digits as its factorization.

81260687 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32256, while the sum is 38.

The square root of 81260687 is about 9014.4709772676. The cubic root of 81260687 is about 433.1385415760.

The spelling of 81260687 in words is "eighty-one million, two hundred sixty thousand, six hundred eighty-seven".