231121001 has 16 divisors (see below), whose sum is σ = 251336448. Its totient is φ = 211680000.

The previous prime is 231120983. The next prime is 231121013. The reversal of 231121001 is 100121132.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-231121001 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (231121021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 307376 + ... + 308126.

It is an arithmetic number, because the mean of its divisors is an integer number (15708528).

Almost surely, 2^231121001 is an apocalyptic number.

It is an amenable number.

231121001 is a deficient number, since it is larger than the sum of its proper divisors (20215447).

231121001 is a wasteful number, since it uses less digits than its factorization.

231121001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1232.

The product of its (nonzero) digits is 12, while the sum is 11.

The square root of 231121001 is about 15202.6642730806. The cubic root of 231121001 is about 613.6863590348.

Adding to 231121001 its reverse (100121132), we get a palindrome (331242133).

The spelling of 231121001 in words is "two hundred thirty-one million, one hundred twenty-one thousand, one".