201551100 has 36 divisors (see below), whose sum is σ = 583155384. Its totient is φ = 53746880.

The previous prime is 201551083. The next prime is 201551111. The reversal of 201551100 is 1155102.

201551100 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×201551100² = 81245691822420000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 201551100.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 335619 + ... + 336218.

Almost surely, 2^201551100 is an apocalyptic number.

201551100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

201551100 is an abundant number, since it is smaller than the sum of its proper divisors (381604284).

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

201551100 is a wasteful number, since it uses less digits than its factorization.

201551100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 671854 (or 671847 counting only the distinct ones).

The product of its (nonzero) digits is 50, while the sum is 15.

The square root of 201551100 is about 14196.8693732104. The cubic root of 201551100 is about 586.3114707404.

The spelling of 201551100 in words is "two hundred one million, five hundred fifty-one thousand, one hundred".