19901107 has 2 divisors, whose sum is σ = 19901108. Its totient is φ = 19901106.

The previous prime is 19901093. The next prime is 19901143. The reversal of 19901107 is 70110991.

It is a weak prime.

It is an emirp because it is prime and its reverse (70110991) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19901107 is a prime.

It is not a weakly prime, because it can be changed into another prime (19901507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9950553 + 9950554.

It is an arithmetic number, because the mean of its divisors is an integer number (9950554).

Almost surely, 2^19901107 is an apocalyptic number.

19901107 is a deficient number, since it is larger than the sum of its proper divisors (1).

19901107 is an equidigital number, since it uses as much as digits as its factorization.

19901107 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 567, while the sum is 28.

The square root of 19901107 is about 4461.0656798572. The cubic root of 19901107 is about 270.9936273879.

The spelling of 19901107 in words is "nineteen million, nine hundred one thousand, one hundred seven".