1213131123 has 12 divisors (see below), whose sum is σ = 1755905008. Its totient is φ = 807090480.

The previous prime is 1213131109. The next prime is 1213131137. The reversal of 1213131123 is 3211313121.

1213131123 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (1213131109) and next prime (1213131137).

It is not a de Polignac number, because 1213131123 - 2¹³ = 1213122931 is a prime.

It is a super-2 number, since 2×1213131123² = 2943374243182482258, 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 = 1213131096 and 1213131105.

It is not an unprimeable number, because it can be changed into a prime (1213131163) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 134008 + ... + 142773.

Almost surely, 2^1213131123 is an apocalyptic number.

1213131123 is a deficient number, since it is larger than the sum of its proper divisors (542773885).

1213131123 is a wasteful number, since it uses less digits than its factorization.

1213131123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 277274 (or 277271 counting only the distinct ones).

The product of its digits is 108, while the sum is 18.

The square root of 1213131123 is about 34830.0319121301. The cubic root of 1213131123 is about 1066.5205998014.

Adding to 1213131123 its reverse (3211313121), we get a palindrome (4424444244).

The spelling of 1213131123 in words is "one billion, two hundred thirteen million, one hundred thirty-one thousand, one hundred twenty-three".