5123640191 has 4 divisors (see below), whose sum is σ = 5125520400. Its totient is φ = 5121759984.

The previous prime is 5123640169. The next prime is 5123640209. The reversal of 5123640191 is 1910463215.

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 5123640191 - 2⁶ = 5123640127 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 (5123649191) 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, 936011 + ... + 941468.

It is an arithmetic number, because the mean of its divisors is an integer number (1281380100).

Almost surely, 2^5123640191 is an apocalyptic number.

5123640191 is a deficient number, since it is larger than the sum of its proper divisors (1880209).

5123640191 is a wasteful number, since it uses less digits than its factorization.

5123640191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1880208.

The product of its (nonzero) digits is 6480, while the sum is 32.

The square root of 5123640191 is about 71579.6073683001. The cubic root of 5123640191 is about 1723.9561216028.

The spelling of 5123640191 in words is "five billion, one hundred twenty-three million, six hundred forty thousand, one hundred ninety-one".