1230120311 has 4 divisors (see below), whose sum is σ = 1405851792. Its totient is φ = 1054388832.

The previous prime is 1230120271. The next prime is 1230120317. The reversal of 1230120311 is 1130210321.

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

It is not a de Polignac number, because 1230120311 - 2¹⁸ = 1229858167 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 (1230120317) 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, 87865730 + ... + 87865743.

It is an arithmetic number, because the mean of its divisors is an integer number (351462948).

Almost surely, 2^1230120311 is an apocalyptic number.

1230120311 is a deficient number, since it is larger than the sum of its proper divisors (175731481).

1230120311 is an equidigital number, since it uses as much as digits as its factorization.

1230120311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175731480.

The product of its (nonzero) digits is 36, while the sum is 14.

The square root of 1230120311 is about 35073.0710232224. The cubic root of 1230120311 is about 1071.4762024734.

Adding to 1230120311 its reverse (1130210321), we get a palindrome (2360330632).

The spelling of 1230120311 in words is "one billion, two hundred thirty million, one hundred twenty thousand, three hundred eleven".