81514087 has 4 divisors (see below), whose sum is σ = 81532656. Its totient is φ = 81495520.

The previous prime is 81514079. The next prime is 81514091. The reversal of 81514087 is 78041518.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78041518 = 2 ⋅39020759.

It is a cyclic number.

It is not a de Polignac number, because 81514087 - 2³ = 81514079 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 (81514067) 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, 1398 + ... + 12844.

It is an arithmetic number, because the mean of its divisors is an integer number (20383164).

Almost surely, 2^81514087 is an apocalyptic number.

81514087 is a deficient number, since it is larger than the sum of its proper divisors (18569).

81514087 is a wasteful number, since it uses less digits than its factorization.

81514087 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18568.

The product of its (nonzero) digits is 8960, while the sum is 34.

The square root of 81514087 is about 9028.5152156930. The cubic root of 81514087 is about 433.5883015611.

The spelling of 81514087 in words is "eighty-one million, five hundred fourteen thousand, eighty-seven".