1321131001 has 2 divisors, whose sum is σ = 1321131002. Its totient is φ = 1321131000.

The previous prime is 1321130981. The next prime is 1321131023. The reversal of 1321131001 is 1001311231.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1019205625 + 301925376 = 31925^2 + 17376^2 .

It is a cyclic number.

It is not a de Polignac number, because 1321131001 - 2⁵ = 1321130969 is a prime.

It is not a weakly prime, because it can be changed into another prime (1322131001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660565500 + 660565501.

It is an arithmetic number, because the mean of its divisors is an integer number (660565501).

Almost surely, 2^1321131001 is an apocalyptic number.

It is an amenable number.

1321131001 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321131001 is an equidigital number, since it uses as much as digits as its factorization.

1321131001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18, while the sum is 13.

The square root of 1321131001 is about 36347.3658055161. The cubic root of 1321131001 is about 1097.2745201244.

Adding to 1321131001 its reverse (1001311231), we get a palindrome (2322442232).

The spelling of 1321131001 in words is "one billion, three hundred twenty-one million, one hundred thirty-one thousand, one".