83131387 has 4 divisors (see below), whose sum is σ = 83302576. Its totient is φ = 82960200.

The previous prime is 83131381. The next prime is 83131393. The reversal of 83131387 is 78313138.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78313138 = 2 ⋅39156569.

It is an interprime number because it is at equal distance from previous prime (83131381) and next prime (83131393).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-83131387 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (83131381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 84864 + ... + 85837.

It is an arithmetic number, because the mean of its divisors is an integer number (20825644).

Almost surely, 2^83131387 is an apocalyptic number.

83131387 is a deficient number, since it is larger than the sum of its proper divisors (171189).

83131387 is a wasteful number, since it uses less digits than its factorization.

83131387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171188.

The product of its digits is 12096, while the sum is 34.

The square root of 83131387 is about 9117.6415261843. The cubic root of 83131387 is about 436.4371142272.

The spelling of 83131387 in words is "eighty-three million, one hundred thirty-one thousand, three hundred eighty-seven".