1231121001 has 8 divisors (see below), whose sum is σ = 1790721504. Its totient is φ = 746133920.

The previous prime is 1231120999. The next prime is 1231121039. The reversal of 1231121001 is 1001211321.

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 1231121001 - 2¹ = 1231120999 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1231141001) 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, 18653316 + ... + 18653381.

It is an arithmetic number, because the mean of its divisors is an integer number (223840188).

Almost surely, 2^1231121001 is an apocalyptic number.

1231121001 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1231121001 is a deficient number, since it is larger than the sum of its proper divisors (559600503).

1231121001 is a wasteful number, since it uses less digits than its factorization.

1231121001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37306711.

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

The square root of 1231121001 is about 35087.3339112564. Note that the first 3 decimals coincide. The cubic root of 1231121001 is about 1071.7666686165.

Adding to 1231121001 its reverse (1001211321), we get a palindrome (2232332322).

The spelling of 1231121001 in words is "one billion, two hundred thirty-one million, one hundred twenty-one thousand, one".