1201323031 has 4 divisors (see below), whose sum is σ = 1201422672. Its totient is φ = 1201223392.

The previous prime is 1201323029. The next prime is 1201323043. The reversal of 1201323031 is 1303231021.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1303231021 = 3049 ⋅427429.

It is a cyclic number.

It is not a de Polignac number, because 1201323031 - 2¹ = 1201323029 is a prime.

It is a super-3 number, since 3×1201323031³ (a number of 28 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1201322996 and 1201323014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1201323091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28771 + ... + 56836.

It is an arithmetic number, because the mean of its divisors is an integer number (300355668).

Almost surely, 2^1201323031 is an apocalyptic number.

1201323031 is a deficient number, since it is larger than the sum of its proper divisors (99641).

1201323031 is an equidigital number, since it uses as much as digits as its factorization.

1201323031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99640.

The product of its (nonzero) digits is 108, while the sum is 16.

The square root of 1201323031 is about 34660.1071983339. The cubic root of 1201323031 is about 1063.0489619199.

Adding to 1201323031 its reverse (1303231021), we get a palindrome (2504554052).

The spelling of 1201323031 in words is "one billion, two hundred one million, three hundred twenty-three thousand, thirty-one".