1231440121 has 8 divisors (see below), whose sum is σ = 1235468160. Its totient is φ = 1227419952.

The previous prime is 1231440097. The next prime is 1231440127. The reversal of 1231440121 is 1210441321.

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

It is a cyclic number.

It is not a de Polignac number, because 1231440121 - 2²¹ = 1229342969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1231440127) 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, 482976 + ... + 485518.

It is an arithmetic number, because the mean of its divisors is an integer number (154433520).

Almost surely, 2^1231440121 is an apocalyptic number.

It is an amenable number.

1231440121 is a deficient number, since it is larger than the sum of its proper divisors (4028039).

1231440121 is an equidigital number, since it uses as much as digits as its factorization.

1231440121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3935.

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 1231440121 is about 35091.8811265512. The cubic root of 1231440121 is about 1071.8592651556.

Adding to 1231440121 its reverse (1210441321), we get a palindrome (2441881442).

The spelling of 1231440121 in words is "one billion, two hundred thirty-one million, four hundred forty thousand, one hundred twenty-one".