6438502191 has 16 divisors (see below), whose sum is σ = 9915982848. Its totient is φ = 3672585600.

The previous prime is 6438502183. The next prime is 6438502207. The reversal of 6438502191 is 1912058346.

It is not a de Polignac number, because 6438502191 - 2³ = 6438502183 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6438502111) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5737855 + ... + 5738976.

It is an arithmetic number, because the mean of its divisors is an integer number (619748928).

Almost surely, 2^6438502191 is an apocalyptic number.

6438502191 is a deficient number, since it is larger than the sum of its proper divisors (3477480657).

6438502191 is a wasteful number, since it uses less digits than its factorization.

6438502191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11476862.

The product of its (nonzero) digits is 51840, while the sum is 39.

The square root of 6438502191 is about 80240.2778596884. The cubic root of 6438502191 is about 1860.3512450895.

The spelling of 6438502191 in words is "six billion, four hundred thirty-eight million, five hundred two thousand, one hundred ninety-one".