81276297 has 4 divisors (see below), whose sum is σ = 108368400. Its totient is φ = 54184196.

The previous prime is 81276289. The next prime is 81276311. The reversal of 81276297 is 79267218.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 81276297 - 2³ = 81276289 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81276257) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13546047 + ... + 13546052.

It is an arithmetic number, because the mean of its divisors is an integer number (27092100).

Almost surely, 2^81276297 is an apocalyptic number.

It is an amenable number.

81276297 is a deficient number, since it is larger than the sum of its proper divisors (27092103).

81276297 is a wasteful number, since it uses less digits than its factorization.

81276297 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27092102.

The product of its digits is 84672, while the sum is 42.

The square root of 81276297 is about 9015.3367657565. The cubic root of 81276297 is about 433.1662747887.

The spelling of 81276297 in words is "eighty-one million, two hundred seventy-six thousand, two hundred ninety-seven".