19916901 has 8 divisors (see below), whose sum is σ = 29506560. Its totient is φ = 13277916.

The previous prime is 19916899. The next prime is 19916903. The reversal of 19916901 is 10961991.

It is an interprime number because it is at equal distance from previous prime (19916899) and next prime (19916903).

It is not a de Polignac number, because 19916901 - 2¹ = 19916899 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19916903) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 368805 + ... + 368858.

It is an arithmetic number, because the mean of its divisors is an integer number (3688320).

Almost surely, 2^19916901 is an apocalyptic number.

It is an amenable number.

19916901 is a deficient number, since it is larger than the sum of its proper divisors (9589659).

19916901 is an equidigital number, since it uses as much as digits as its factorization.

19916901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 737672 (or 737666 counting only the distinct ones).

The product of its (nonzero) digits is 4374, while the sum is 36.

The square root of 19916901 is about 4462.8355336042. The cubic root of 19916901 is about 271.0652974646.

The spelling of 19916901 in words is "nineteen million, nine hundred sixteen thousand, nine hundred one".