19891201 has 8 divisors (see below), whose sum is σ = 22068000. Its totient is φ = 17775840.

The previous prime is 19891189. The next prime is 19891213. The reversal of 19891201 is 10219891.

It is an interprime number because it is at equal distance from previous prime (19891189) and next prime (19891213).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 19891201 - 2⁷ = 19891073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19894201) 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, 14676 + ... + 15973.

It is an arithmetic number, because the mean of its divisors is an integer number (2758500).

Almost surely, 2^19891201 is an apocalyptic number.

19891201 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

19891201 is a deficient number, since it is larger than the sum of its proper divisors (2176799).

19891201 is a wasteful number, since it uses less digits than its factorization.

19891201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30719.

The product of its (nonzero) digits is 1296, while the sum is 31.

The square root of 19891201 is about 4459.9552688340. The cubic root of 19891201 is about 270.9486565495.

The spelling of 19891201 in words is "nineteen million, eight hundred ninety-one thousand, two hundred one".