1231120001 has 4 divisors (see below), whose sum is σ = 1244952900. Its totient is φ = 1217287104.

The previous prime is 1231119983. The next prime is 1231120003. The reversal of 1231120001 is 1000211321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1000211321 = 593 ⋅1686697.

It can be written as a sum of positive squares in 2 ways, for example, as 704371600 + 526748401 = 26540^2 + 22951^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1231120001 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 (1231120003) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6916316 + ... + 6916493.

It is an arithmetic number, because the mean of its divisors is an integer number (311238225).

Almost surely, 2^1231120001 is an apocalyptic number.

It is an amenable number.

1231120001 is a deficient number, since it is larger than the sum of its proper divisors (13832899).

1231120001 is an equidigital number, since it uses as much as digits as its factorization.

1231120001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13832898.

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

The square root of 1231120001 is about 35087.3196610969. The cubic root of 1231120001 is about 1071.7663784293.

Adding to 1231120001 its reverse (1000211321), we get a palindrome (2231331322).

The spelling of 1231120001 in words is "one billion, two hundred thirty-one million, one hundred twenty thousand, one".