8139493237 has 4 divisors (see below), whose sum is σ = 8157073600. Its totient is φ = 8121912876.

The previous prime is 8139493231. The next prime is 8139493261. The reversal of 8139493237 is 7323949318.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 8139493237 - 2¹¹ = 8139491189 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 (8139493231) 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, 8789487 + ... + 8790412.

It is an arithmetic number, because the mean of its divisors is an integer number (2039268400).

Almost surely, 2^8139493237 is an apocalyptic number.

It is an amenable number.

8139493237 is a deficient number, since it is larger than the sum of its proper divisors (17580363).

8139493237 is a wasteful number, since it uses less digits than its factorization.

8139493237 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17580362.

The product of its digits is 979776, while the sum is 49.

The square root of 8139493237 is about 90219.1400812488. The cubic root of 8139493237 is about 2011.5575196357.

The spelling of 8139493237 in words is "eight billion, one hundred thirty-nine million, four hundred ninety-three thousand, two hundred thirty-seven".