6139688491 has 4 divisors (see below), whose sum is σ = 6240339184. Its totient is φ = 6039037800.

The previous prime is 6139688483. The next prime is 6139688507. The reversal of 6139688491 is 1948869316.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 6139688491 - 2³ = 6139688483 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6139688461) 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, 50325255 + ... + 50325376.

It is an arithmetic number, because the mean of its divisors is an integer number (1560084796).

Almost surely, 2^6139688491 is an apocalyptic number.

6139688491 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

6139688491 is a deficient number, since it is larger than the sum of its proper divisors (100650693).

6139688491 is a wasteful number, since it uses less digits than its factorization.

6139688491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100650692.

The product of its digits is 2239488, while the sum is 55.

The square root of 6139688491 is about 78356.1643458892. The cubic root of 6139688491 is about 1831.1142637207.

The spelling of 6139688491 in words is "six billion, one hundred thirty-nine million, six hundred eighty-eight thousand, four hundred ninety-one".