1201311113 has 4 divisors (see below), whose sum is σ = 1203180048. Its totient is φ = 1199442180.

The previous prime is 1201311107. The next prime is 1201311121. The reversal of 1201311113 is 3111131021.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 3111131021 = 227 ⋅13705423.

It is a cyclic number.

It is not a de Polignac number, because 1201311113 - 2¹² = 1201307017 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1201311143) 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, 933503 + ... + 934788.

It is an arithmetic number, because the mean of its divisors is an integer number (300795012).

Almost surely, 2^1201311113 is an apocalyptic number.

It is an amenable number.

1201311113 is a deficient number, since it is larger than the sum of its proper divisors (1868935).

1201311113 is an equidigital number, since it uses as much as digits as its factorization.

1201311113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1868934.

The product of its (nonzero) digits is 18, while the sum is 14.

The square root of 1201311113 is about 34659.9352711456. The cubic root of 1201311113 is about 1063.0454465015.

Adding to 1201311113 its reverse (3111131021), we get a palindrome (4312442134).

The spelling of 1201311113 in words is "one billion, two hundred one million, three hundred eleven thousand, one hundred thirteen".