612123191 has 6 divisors (see below), whose sum is σ = 615928320. Its totient is φ = 608341428.

The previous prime is 612123167. The next prime is 612123251. The reversal of 612123191 is 191321216.

It is a de Polignac number, because none of the positive numbers 2^k-612123191 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 612123191.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (612123101) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 15050 + ... + 38088.

It is an arithmetic number, because the mean of its divisors is an integer number (102654720).

Almost surely, 2^612123191 is an apocalyptic number.

612123191 is a deficient number, since it is larger than the sum of its proper divisors (3805129).

612123191 is an equidigital number, since it uses as much as digits as its factorization.

612123191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23365 (or 23202 counting only the distinct ones).

The product of its digits is 648, while the sum is 26.

The square root of 612123191 is about 24741.1234789368. The cubic root of 612123191 is about 849.0754380681.

The spelling of 612123191 in words is "six hundred twelve million, one hundred twenty-three thousand, one hundred ninety-one".