81276253 has 2 divisors, whose sum is σ = 81276254. Its totient is φ = 81276252.

The previous prime is 81276233. The next prime is 81276257. The reversal of 81276253 is 35267218.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 70862724 + 10413529 = 8418^2 + 3227^2 .

It is a cyclic number.

It is not a de Polignac number, because 81276253 - 2²¹ = 79179101 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81276257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40638126 + 40638127.

It is an arithmetic number, because the mean of its divisors is an integer number (40638127).

Almost surely, 2^81276253 is an apocalyptic number.

It is an amenable number.

81276253 is a deficient number, since it is larger than the sum of its proper divisors (1).

81276253 is an equidigital number, since it uses as much as digits as its factorization.

81276253 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20160, while the sum is 34.

The square root of 81276253 is about 9015.3343254701. The cubic root of 81276253 is about 433.1661966219.

The spelling of 81276253 in words is "eighty-one million, two hundred seventy-six thousand, two hundred fifty-three".