201091900 has 36 divisors (see below), whose sum is σ = 437064040. Its totient is φ = 80308800.

The previous prime is 201091871. The next prime is 201091901. The reversal of 201091900 is 9190102.

It is a super-2 number, since 2×201091900² = 80875904491220000, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201091901) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 84730 + ... + 87070.

Almost surely, 2^201091900 is an apocalyptic number.

201091900 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

201091900 is an abundant number, since it is smaller than the sum of its proper divisors (235972140).

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

201091900 is a wasteful number, since it uses less digits than its factorization.

201091900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3214 (or 3207 counting only the distinct ones).

The product of its (nonzero) digits is 162, while the sum is 22.

The square root of 201091900 is about 14180.6875714826. The cubic root of 201091900 is about 585.8658617365.

The spelling of 201091900 in words is "two hundred one million, ninety-one thousand, nine hundred".