81514623 has 4 divisors (see below), whose sum is σ = 108686168. Its totient is φ = 54343080.

The previous prime is 81514597. The next prime is 81514661. The reversal of 81514623 is 32641518.

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

It is a de Polignac number, because none of the positive numbers 2^k-81514623 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81514523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13585768 + ... + 13585773.

It is an arithmetic number, because the mean of its divisors is an integer number (27171542).

Almost surely, 2^81514623 is an apocalyptic number.

81514623 is a deficient number, since it is larger than the sum of its proper divisors (27171545).

81514623 is a wasteful number, since it uses less digits than its factorization.

81514623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27171544.

The product of its digits is 5760, while the sum is 30.

The square root of 81514623 is about 9028.5448993733. The cubic root of 81514623 is about 433.5892519196.

The spelling of 81514623 in words is "eighty-one million, five hundred fourteen thousand, six hundred twenty-three".