1205125391 has 8 divisors (see below), whose sum is σ = 1222855920. Its totient is φ = 1187428032.

The previous prime is 1205125379. The next prime is 1205125417. The reversal of 1205125391 is 1935215021.

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 1205125391 - 2²⁶ = 1138016527 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 (1205125321) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 70316 + ... + 85758.

It is an arithmetic number, because the mean of its divisors is an integer number (152856990).

Almost surely, 2^1205125391 is an apocalyptic number.

1205125391 is a deficient number, since it is larger than the sum of its proper divisors (17730529).

1205125391 is a wasteful number, since it uses less digits than its factorization.

1205125391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16585.

The product of its (nonzero) digits is 2700, while the sum is 29.

The square root of 1205125391 is about 34714.9159728207. The cubic root of 1205125391 is about 1064.1693482568.

The spelling of 1205125391 in words is "one billion, two hundred five million, one hundred twenty-five thousand, three hundred ninety-one".