1001000011901 has 2 divisors, whose sum is σ = 1001000011902. Its totient is φ = 1001000011900.

The previous prime is 1001000011889. The next prime is 1001000011903. The reversal of 1001000011901 is 1091100001001.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 943831680100 + 57168331801 = 971510^2 + 239099^2 .

It is a cyclic number.

It is not a de Polignac number, because 1001000011901 - 2²² = 1000995817597 is a prime.

Together with 1001000011903, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1001000011903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 500500005950 + 500500005951.

It is an arithmetic number, because the mean of its divisors is an integer number (500500005951).

Almost surely, 2^{1001000011901} is an apocalyptic number.

It is an amenable number.

1001000011901 is a deficient number, since it is larger than the sum of its proper divisors (1).

1001000011901 is an equidigital number, since it uses as much as digits as its factorization.

1001000011901 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9, while the sum is 14.

Adding to 1001000011901 its reverse (1091100001001), we get a palindrome (2092100012902).

The spelling of 1001000011901 in words is "one trillion, one billion, eleven thousand, nine hundred one".