1210001291 has 2 divisors, whose sum is σ = 1210001292. Its totient is φ = 1210001290.

The previous prime is 1210001279. The next prime is 1210001321. The reversal of 1210001291 is 1921000121.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1210001291 is a prime.

It is not a weakly prime, because it can be changed into another prime (1210001591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605000645 + 605000646.

It is an arithmetic number, because the mean of its divisors is an integer number (605000646).

Almost surely, 2^1210001291 is an apocalyptic number.

1210001291 is a deficient number, since it is larger than the sum of its proper divisors (1).

1210001291 is an equidigital number, since it uses as much as digits as its factorization.

1210001291 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36, while the sum is 17.

The square root of 1210001291 is about 34785.0728186675. The cubic root of 1210001291 is about 1065.6026157451.

The spelling of 1210001291 in words is "one billion, two hundred ten million, one thousand, two hundred ninety-one".