201097100 has 18 divisors (see below), whose sum is σ = 436380924. Its totient is φ = 80438800.

The previous prime is 201097079. The next prime is 201097139. The reversal of 201097100 is 1790102.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1005386 + ... + 1005585.

Almost surely, 2^201097100 is an apocalyptic number.

201097100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

201097100 is an abundant number, since it is smaller than the sum of its proper divisors (235283824).

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

201097100 is a wasteful number, since it uses less digits than its factorization.

201097100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2010985 (or 2010978 counting only the distinct ones).

The product of its (nonzero) digits is 126, while the sum is 20.

The square root of 201097100 is about 14180.8709182476. The cubic root of 201097100 is about 585.8709116270.

It can be divided in two parts, 20 and 1097100, that multiplied together give a triangular number (21942000 = T₆₆₂₄).

The spelling of 201097100 in words is "two hundred one million, ninety-seven thousand, one hundred".