1205403051 has 4 divisors (see below), whose sum is σ = 1607204072. Its totient is φ = 803602032.

The previous prime is 1205403019. The next prime is 1205403053. The reversal of 1205403051 is 1503045021.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1205403051 - 2⁵ = 1205403019 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1205403053) 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, 200900506 + ... + 200900511.

It is an arithmetic number, because the mean of its divisors is an integer number (401801018).

Almost surely, 2^1205403051 is an apocalyptic number.

1205403051 is a deficient number, since it is larger than the sum of its proper divisors (401801021).

1205403051 is an equidigital number, since it uses as much as digits as its factorization.

1205403051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 401801020.

The product of its (nonzero) digits is 600, while the sum is 21.

The square root of 1205403051 is about 34718.9148879973. The cubic root of 1205403051 is about 1064.2510699248.

Adding to 1205403051 its reverse (1503045021), we get a palindrome (2708448072).

The spelling of 1205403051 in words is "one billion, two hundred five million, four hundred three thousand, fifty-one".