1213231123 has 8 divisors (see below), whose sum is σ = 1338424416. Its totient is φ = 1092590400.

The previous prime is 1213231079. The next prime is 1213231139. The reversal of 1213231123 is 3211323121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1213231123 - 2¹³ = 1213222931 is a prime.

It is a super-2 number, since 2×1213231123² = 2943859515631682258, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1213231123.

It is not an unprimeable number, because it can be changed into a prime (1213231183) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1137583 + ... + 1138648.

It is an arithmetic number, because the mean of its divisors is an integer number (167303052).

Almost surely, 2^1213231123 is an apocalyptic number.

1213231123 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1213231123 is a deficient number, since it is larger than the sum of its proper divisors (125193293).

1213231123 is a wasteful number, since it uses less digits than its factorization.

1213231123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2276285.

The product of its digits is 216, while the sum is 19.

The square root of 1213231123 is about 34831.4674253038. The cubic root of 1213231123 is about 1066.5499038965.

Adding to 1213231123 its reverse (3211323121), we get a palindrome (4424554244).

The spelling of 1213231123 in words is "one billion, two hundred thirteen million, two hundred thirty-one thousand, one hundred twenty-three".