5191191231 has 4 divisors (see below), whose sum is σ = 6921588312. Its totient is φ = 3460794152.

The previous prime is 5191191227. The next prime is 5191191251. The reversal of 5191191231 is 1321911915.

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 5191191231 - 2² = 5191191227 is a prime.

It is a super-2 number, since 2×5191191231² = 53896932793622590722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 5191191192 and 5191191201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5191191251) 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, 865198536 + ... + 865198541.

It is an arithmetic number, because the mean of its divisors is an integer number (1730397078).

Almost surely, 2^5191191231 is an apocalyptic number.

5191191231 is a deficient number, since it is larger than the sum of its proper divisors (1730397081).

5191191231 is a wasteful number, since it uses less digits than its factorization.

5191191231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1730397080.

The product of its digits is 2430, while the sum is 33.

The square root of 5191191231 is about 72049.9217973205. The cubic root of 5191191231 is about 1731.4993885137.

The spelling of 5191191231 in words is "five billion, one hundred ninety-one million, one hundred ninety-one thousand, two hundred thirty-one".