1201323123 has 64 divisors (see below), whose sum is σ = 2389632000. Its totient is φ = 576046080.

The previous prime is 1201323119. The next prime is 1201323163. The reversal of 1201323123 is 3213231021.

It is not a de Polignac number, because 1201323123 - 2² = 1201323119 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1201323096 and 1201323105.

It is not an unprimeable number, because it can be changed into a prime (1201323163) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 4803 + ... + 49251.

It is an arithmetic number, because the mean of its divisors is an integer number (37338000).

Almost surely, 2^1201323123 is an apocalyptic number.

1201323123 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1201323123 is a deficient number, since it is larger than the sum of its proper divisors (1188308877).

1201323123 is a wasteful number, since it uses less digits than its factorization.

1201323123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44489 (or 44483 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

The square root of 1201323123 is about 34660.1085255081. The cubic root of 1201323123 is about 1063.0489890568.

Adding to 1201323123 its reverse (3213231021), we get a palindrome (4414554144).

The spelling of 1201323123 in words is "one billion, two hundred one million, three hundred twenty-three thousand, one hundred twenty-three".