1331213123 has 8 divisors (see below), whose sum is σ = 1335747840. Its totient is φ = 1326686400.

The previous prime is 1331213089. The next prime is 1331213153. The reversal of 1331213123 is 3213121331.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1331213123 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1331213095 and 1331213104.

It is not an unprimeable number, because it can be changed into a prime (1331213153) 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, 593438 + ... + 595676.

It is an arithmetic number, because the mean of its divisors is an integer number (166968480).

Almost surely, 2^1331213123 is an apocalyptic number.

1331213123 is a deficient number, since it is larger than the sum of its proper divisors (4534717).

1331213123 is a wasteful number, since it uses less digits than its factorization.

1331213123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3997.

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

The square root of 1331213123 is about 36485.7934407353. The cubic root of 1331213123 is about 1100.0587084368.

Adding to 1331213123 its reverse (3213121331), we get a palindrome (4544334454).

The spelling of 1331213123 in words is "one billion, three hundred thirty-one million, two hundred thirteen thousand, one hundred twenty-three".