1291001 has 2 divisors, whose sum is σ = 1291002. Its totient is φ = 1291000.

The previous prime is 1290983. The next prime is 1291007. The reversal of 1291001 is 1001921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1157776 + 133225 = 1076^2 + 365^2 .

It is a cyclic number.

It is not a de Polignac number, because 1291001 - 2⁶ = 1290937 is a prime.

It is not a weakly prime, because it can be changed into another prime (1291007) 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 as a sum of consecutive naturals, namely, 645500 + 645501.

It is an arithmetic number, because the mean of its divisors is an integer number (645501).

2^1291001 is an apocalyptic number.

It is an amenable number.

1291001 is a deficient number, since it is larger than the sum of its proper divisors (1).

1291001 is an equidigital number, since it uses as much as digits as its factorization.

1291001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18, while the sum is 14.

The square root of 1291001 is about 1136.2222493861. Note that the first 4 decimals coincide. The cubic root of 1291001 is about 108.8868730634.

Adding to 1291001 its reverse (1001921), we get a palindrome (2292922).

The spelling of 1291001 in words is "one million, two hundred ninety-one thousand, one".