1205206051 has 4 divisors (see below), whose sum is σ = 1377378352. Its totient is φ = 1033033752.

The previous prime is 1205206031. The next prime is 1205206073. The reversal of 1205206051 is 1506025021.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1506025021 = 2383 ⋅631987.

It is a cyclic number.

It is not a de Polignac number, because 1205206051 - 2¹¹ = 1205204003 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1205206001) 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, 86086140 + ... + 86086153.

It is an arithmetic number, because the mean of its divisors is an integer number (344344588).

Almost surely, 2^1205206051 is an apocalyptic number.

1205206051 is a deficient number, since it is larger than the sum of its proper divisors (172172301).

1205206051 is an equidigital number, since it uses as much as digits as its factorization.

1205206051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172172300.

The product of its (nonzero) digits is 600, while the sum is 22.

The square root of 1205206051 is about 34716.0777018372. The cubic root of 1205206051 is about 1064.1930896271.

The spelling of 1205206051 in words is "one billion, two hundred five million, two hundred six thousand, fifty-one".