81276413 has 2 divisors, whose sum is σ = 81276414. Its totient is φ = 81276412.

The previous prime is 81276361. The next prime is 81276443. The reversal of 81276413 is 31467218.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 47844889 + 33431524 = 6917^2 + 5782^2 .

It is a cyclic number.

It is not a de Polignac number, because 81276413 - 2⁸ = 81276157 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 81276413.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81276443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40638206 + 40638207.

It is an arithmetic number, because the mean of its divisors is an integer number (40638207).

Almost surely, 2^81276413 is an apocalyptic number.

It is an amenable number.

81276413 is a deficient number, since it is larger than the sum of its proper divisors (1).

81276413 is an equidigital number, since it uses as much as digits as its factorization.

81276413 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8064, while the sum is 32.

The square root of 81276413 is about 9015.3431992354. The cubic root of 81276413 is about 433.1664808646.

The spelling of 81276413 in words is "eighty-one million, two hundred seventy-six thousand, four hundred thirteen".