1204161311 has 4 divisors (see below), whose sum is σ = 1204447392. Its totient is φ = 1203875232.

The previous prime is 1204161253. The next prime is 1204161341. The reversal of 1204161311 is 1131614021.

It is a happy number.

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 1204161311 - 2²² = 1199967007 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 (1204161341) 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, 136631 + ... + 145176.

It is an arithmetic number, because the mean of its divisors is an integer number (301111848).

Almost surely, 2^1204161311 is an apocalyptic number.

1204161311 is a deficient number, since it is larger than the sum of its proper divisors (286081).

1204161311 is an equidigital number, since it uses as much as digits as its factorization.

1204161311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 286080.

The product of its (nonzero) digits is 144, while the sum is 20.

The square root of 1204161311 is about 34701.0275208098. The cubic root of 1204161311 is about 1063.8855000382.

Adding to 1204161311 its reverse (1131614021), we get a palindrome (2335775332).

The spelling of 1204161311 in words is "one billion, two hundred four million, one hundred sixty-one thousand, three hundred eleven".