81264097 has 4 divisors (see below), whose sum is σ = 86044356. Its totient is φ = 76483840.

The previous prime is 81264089. The next prime is 81264101. The reversal of 81264097 is 79046218.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 37161216 + 44102881 = 6096^2 + 6641^2 .

It is a cyclic number.

It is not a de Polignac number, because 81264097 - 2³ = 81264089 is a prime.

It is a super-2 number, since 2×81264097² = 13207706922450818, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81264067) 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, 2390104 + ... + 2390137.

It is an arithmetic number, because the mean of its divisors is an integer number (21511089).

Almost surely, 2^81264097 is an apocalyptic number.

It is an amenable number.

81264097 is a deficient number, since it is larger than the sum of its proper divisors (4780259).

81264097 is a wasteful number, since it uses less digits than its factorization.

81264097 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4780258.

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 81264097 is about 9014.6601156117. The cubic root of 81264097 is about 433.1446001915.

The spelling of 81264097 in words is "eighty-one million, two hundred sixty-four thousand, ninety-seven".