1213118031 has 4 divisors (see below), whose sum is σ = 1617490712. Its totient is φ = 808745352.

The previous prime is 1213118017. The next prime is 1213118047. The reversal of 1213118031 is 1308113121.

It is a happy number.

1213118031 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 1213118031 - 2⁶ = 1213117967 is a prime.

It is a super-2 number, since 2×1213118031² = 2943310714274633922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1213117989 and 1213118007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213118531) 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, 202186336 + ... + 202186341.

It is an arithmetic number, because the mean of its divisors is an integer number (404372678).

Almost surely, 2^1213118031 is an apocalyptic number.

1213118031 is a deficient number, since it is larger than the sum of its proper divisors (404372681).

1213118031 is an equidigital number, since it uses as much as digits as its factorization.

1213118031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 404372680.

The product of its (nonzero) digits is 144, while the sum is 21.

The square root of 1213118031 is about 34829.8439703654. The cubic root of 1213118031 is about 1066.5167631900.

The spelling of 1213118031 in words is "one billion, two hundred thirteen million, one hundred eighteen thousand, thirty-one".