1231123401 has 8 divisors (see below), whose sum is σ = 1823886560. Its totient is φ = 820748916.

The previous prime is 1231123351. The next prime is 1231123403. The reversal of 1231123401 is 1043211321.

1231123401 is a `hidden beast` number, since 12 + 311 + 2 + 340 + 1 = 666.

It is not a de Polignac number, because 1231123401 - 2⁶ = 1231123337 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1231123403) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22798555 + ... + 22798608.

It is an arithmetic number, because the mean of its divisors is an integer number (227985820).

Almost surely, 2^1231123401 is an apocalyptic number.

It is an amenable number.

1231123401 is a deficient number, since it is larger than the sum of its proper divisors (592763159).

1231123401 is an equidigital number, since it uses as much as digits as its factorization.

1231123401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45597172 (or 45597166 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 1231123401 is about 35087.3681116153. The cubic root of 1231123401 is about 1071.7673650654.

Adding to 1231123401 its reverse (1043211321), we get a palindrome (2274334722).

The spelling of 1231123401 in words is "one billion, two hundred thirty-one million, one hundred twenty-three thousand, four hundred one".