612191 has 8 divisors (see below), whose sum is σ = 654720. Its totient is φ = 571032.

The previous prime is 612181. The next prime is 612193. The reversal of 612191 is 191216.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 612191 - 2¹⁴ = 595807 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 (612193) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 680 + ... + 1298.

It is an arithmetic number, because the mean of its divisors is an integer number (81840).

2⁶¹²¹⁹¹ is an apocalyptic number.

612191 is a deficient number, since it is larger than the sum of its proper divisors (42529).

612191 is a wasteful number, since it uses less digits than its factorization.

612191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 685.

The product of its digits is 108, while the sum is 20.

The square root of 612191 is about 782.4263543619. The cubic root of 612191 is about 84.9106789508.

Subtracting from 612191 its sum of digits (20), we obtain a triangular number (612171 = T₁₁₀₆).

The spelling of 612191 in words is "six hundred twelve thousand, one hundred ninety-one".