1230123311 has 4 divisors (see below), whose sum is σ = 1241009472. Its totient is φ = 1219237152.

The previous prime is 1230123277. The next prime is 1230123313. The reversal of 1230123311 is 1133210321.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1230123311 is a prime.

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 1230123311.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1230123313) 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, 5442911 + ... + 5443136.

It is an arithmetic number, because the mean of its divisors is an integer number (310252368).

Almost surely, 2^1230123311 is an apocalyptic number.

1230123311 is a deficient number, since it is larger than the sum of its proper divisors (10886161).

1230123311 is a wasteful number, since it uses less digits than its factorization.

1230123311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10886160.

The product of its (nonzero) digits is 108, while the sum is 17.

The square root of 1230123311 is about 35073.1137910508. The cubic root of 1230123311 is about 1071.4770735064.

Adding to 1230123311 its reverse (1133210321), we get a palindrome (2363333632).

The spelling of 1230123311 in words is "one billion, two hundred thirty million, one hundred twenty-three thousand, three hundred eleven".