81132097 has 4 divisors (see below), whose sum is σ = 81164736. Its totient is φ = 81099460.

The previous prime is 81132091. The next prime is 81132113. The reversal of 81132097 is 79023118.

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 a de Polignac number, because none of the positive numbers 2^k-81132097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81132091) 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, 12253 + ... + 17674.

It is an arithmetic number, because the mean of its divisors is an integer number (20291184).

Almost surely, 2^81132097 is an apocalyptic number.

It is an amenable number.

81132097 is a deficient number, since it is larger than the sum of its proper divisors (32639).

81132097 is a wasteful number, since it uses less digits than its factorization.

81132097 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32638.

The product of its (nonzero) digits is 3024, while the sum is 31.

The square root of 81132097 is about 9007.3357326126. The cubic root of 81132097 is about 432.9099493250.

The spelling of 81132097 in words is "eighty-one million, one hundred thirty-two thousand, ninety-seven".