1231121023 has 8 divisors (see below), whose sum is σ = 1401434496. Its totient is φ = 1070539800.

The previous prime is 1231120999. The next prime is 1231121039. The reversal of 1231121023 is 3201211321.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1231121023 - 2¹⁷ = 1230989951 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1231120988 and 1231121006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231121123) 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 7 ways as a sum of consecutive naturals, for example, 2432793 + ... + 2433298.

It is an arithmetic number, because the mean of its divisors is an integer number (175179312).

Almost surely, 2^1231121023 is an apocalyptic number.

1231121023 is a deficient number, since it is larger than the sum of its proper divisors (170313473).

1231121023 is a wasteful number, since it uses less digits than its factorization.

1231121023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4866125.

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

The square root of 1231121023 is about 35087.3342247598. The cubic root of 1231121023 is about 1071.7666750007.

Adding to 1231121023 its reverse (3201211321), we get a palindrome (4432332344).

The spelling of 1231121023 in words is "one billion, two hundred thirty-one million, one hundred twenty-one thousand, twenty-three".