1201231023 has 4 divisors (see below), whose sum is σ = 1601641368. Its totient is φ = 800820680.

The previous prime is 1201231013. The next prime is 1201231027. The reversal of 1201231023 is 3201321021.

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

It is a cyclic number.

It is not a de Polignac number, because 1201231023 - 2¹⁰ = 1201229999 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1201230993 and 1201231011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1201231027) 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, 200205168 + ... + 200205173.

It is an arithmetic number, because the mean of its divisors is an integer number (400410342).

Almost surely, 2^1201231023 is an apocalyptic number.

1201231023 is a deficient number, since it is larger than the sum of its proper divisors (400410345).

1201231023 is an equidigital number, since it uses as much as digits as its factorization.

1201231023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 400410344.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 1201231023 is about 34658.7798833138. The cubic root of 1201231023 is about 1063.0218219796.

Adding to 1201231023 its reverse (3201321021), we get a palindrome (4402552044).

The spelling of 1201231023 in words is "one billion, two hundred one million, two hundred thirty-one thousand, twenty-three".