1001001193901 has 2 divisors, whose sum is σ = 1001001193902. Its totient is φ = 1001001193900.

The previous prime is 1001001193891. The next prime is 1001001193961. The reversal of 1001001193901 is 1093911001001.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 790545043876 + 210456150025 = 889126^2 + 458755^2 .

It is a cyclic number.

It is not a de Polignac number, because 1001001193901 - 2⁶ = 1001001193837 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1001001193961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 500500596950 + 500500596951.

It is an arithmetic number, because the mean of its divisors is an integer number (500500596951).

Almost surely, 2^{1001001193901} is an apocalyptic number.

It is an amenable number.

1001001193901 is a deficient number, since it is larger than the sum of its proper divisors (1).

1001001193901 is an equidigital number, since it uses as much as digits as its factorization.

1001001193901 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 243, while the sum is 26.

Adding to 1001001193901 its reverse (1093911001001), we get a palindrome (2094912194902).

The spelling of 1001001193901 in words is "one trillion, one billion, one million, one hundred ninety-three thousand, nine hundred one".