1203231121 has 4 divisors (see below), whose sum is σ = 1211887600. Its totient is φ = 1194574644.

The previous prime is 1203231103. The next prime is 1203231149. The reversal of 1203231121 is 1211323021.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1211323021 = 881 ⋅1374941.

It is a cyclic number.

It is not a de Polignac number, because 1203231121 - 2¹¹ = 1203229073 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1203231095 and 1203231104.

It is not an unprimeable number, because it can be changed into a prime (1203231101) 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, 4328031 + ... + 4328308.

It is an arithmetic number, because the mean of its divisors is an integer number (302971900).

Almost surely, 2^1203231121 is an apocalyptic number.

It is an amenable number.

1203231121 is a deficient number, since it is larger than the sum of its proper divisors (8656479).

1203231121 is an equidigital number, since it uses as much as digits as its factorization.

1203231121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8656478.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 1203231121 is about 34687.6220141998. The cubic root of 1203231121 is about 1063.6114862016.

Adding to 1203231121 its reverse (1211323021), we get a palindrome (2414554142).

It can be divided in two parts, 1203 and 231121, that added together give a square (232324 = 482²).

The spelling of 1203231121 in words is "one billion, two hundred three million, two hundred thirty-one thousand, one hundred twenty-one".