81483187 has 4 divisors (see below), whose sum is σ = 81520336. Its totient is φ = 81446040.

The previous prime is 81483167. The next prime is 81483203. The reversal of 81483187 is 78138418.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78138418 = 2 ⋅39069209.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81483187 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81483107) 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, 15063 + ... + 19744.

It is an arithmetic number, because the mean of its divisors is an integer number (20380084).

Almost surely, 2^81483187 is an apocalyptic number.

81483187 is a deficient number, since it is larger than the sum of its proper divisors (37149).

81483187 is a wasteful number, since it uses less digits than its factorization.

81483187 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37148.

The product of its digits is 43008, while the sum is 40.

The square root of 81483187 is about 9026.8038086579. The cubic root of 81483187 is about 433.5335070574.

The spelling of 81483187 in words is "eighty-one million, four hundred eighty-three thousand, one hundred eighty-seven".