1213313123 has 16 divisors (see below), whose sum is σ = 1399652352. Its totient is φ = 1041384000.

The previous prime is 1213313099. The next prime is 1213313147. The reversal of 1213313123 is 3213133121.

It is an interprime number because it is at equal distance from previous prime (1213313099) and next prime (1213313147).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1213313123 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1213313095 and 1213313104.

It is not an unprimeable number, because it can be changed into a prime (1213303123) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29411 + ... + 57372.

It is an arithmetic number, because the mean of its divisors is an integer number (87478272).

Almost surely, 2^1213313123 is an apocalyptic number.

1213313123 is a deficient number, since it is larger than the sum of its proper divisors (186339229).

1213313123 is a wasteful number, since it uses less digits than its factorization.

1213313123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86866.

The product of its digits is 324, while the sum is 20.

The square root of 1213313123 is about 34832.6445019611. The cubic root of 1213313123 is about 1066.5739320530.

Adding to 1213313123 its reverse (3213133121), we get a palindrome (4426446244).

The spelling of 1213313123 in words is "one billion, two hundred thirteen million, three hundred thirteen thousand, one hundred twenty-three".