8139851 has 4 divisors (see below), whose sum is σ = 8231400. Its totient is φ = 8048304.

The previous prime is 8139829. The next prime is 8139869. The reversal of 8139851 is 1589318.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1589318 = 2 ⋅794659.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8139851 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8139871) 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, 45641 + ... + 45818.

It is an arithmetic number, because the mean of its divisors is an integer number (2057850).

Almost surely, 2^8139851 is an apocalyptic number.

8139851 is a deficient number, since it is larger than the sum of its proper divisors (91549).

8139851 is an equidigital number, since it uses as much as digits as its factorization.

8139851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91548.

The product of its digits is 8640, while the sum is 35.

The square root of 8139851 is about 2853.0424111814. The cubic root of 8139851 is about 201.1586991180.

The spelling of 8139851 in words is "eight million, one hundred thirty-nine thousand, eight hundred fifty-one".