1205194231 has 4 divisors (see below), whose sum is σ = 1210906264. Its totient is φ = 1199482200.

The previous prime is 1205194213. The next prime is 1205194241. The reversal of 1205194231 is 1324915021.

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 1205194231 - 2⁷ = 1205194103 is a prime.

It is a super-2 number, since 2×1205194231² = 2904986268871362722, which contains 22 as substring.

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 1205194231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1205194241) 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, 2855700 + ... + 2856121.

It is an arithmetic number, because the mean of its divisors is an integer number (302726566).

Almost surely, 2^1205194231 is an apocalyptic number.

1205194231 is a deficient number, since it is larger than the sum of its proper divisors (5712033).

1205194231 is an equidigital number, since it uses as much as digits as its factorization.

1205194231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5712032.

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 1205194231 is about 34715.9074632941. The cubic root of 1205194231 is about 1064.1896106084.

It can be divided in two parts, 120519 and 4231, that added together give a triangular number (124750 = T₄₉₉).

The spelling of 1205194231 in words is "one billion, two hundred five million, one hundred ninety-four thousand, two hundred thirty-one".