201491000 has 32 divisors (see below), whose sum is σ = 471491280. Its totient is φ = 80596000.

The previous prime is 201490997. The next prime is 201491027. The reversal of 201491000 is 194102.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 201491000.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 99746 + ... + 101745.

Almost surely, 2^201491000 is an apocalyptic number.

201491000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

201491000 is an abundant number, since it is smaller than the sum of its proper divisors (270000280).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

201491000 is a wasteful number, since it uses less digits than its factorization.

201491000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 201512 (or 201498 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 201491000 is about 14194.7525515593. The cubic root of 201491000 is about 586.2531880478.

The spelling of 201491000 in words is "two hundred one million, four hundred ninety-one thousand".