201171640 has 32 divisors (see below), whose sum is σ = 456652080. Its totient is φ = 79754752.

The previous prime is 201171583. The next prime is 201171643. The reversal of 201171640 is 46171102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201171643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17734 + ... + 26773.

Almost surely, 2^201171640 is an apocalyptic number.

201171640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

201171640 is an abundant number, since it is smaller than the sum of its proper divisors (255480440).

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

201171640 is a wasteful number, since it uses less digits than its factorization.

201171640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44631 (or 44627 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 22.

The square root of 201171640 is about 14183.4988631155. The cubic root of 201171640 is about 585.9432902989.

The spelling of 201171640 in words is "two hundred one million, one hundred seventy-one thousand, six hundred forty".