201156550 has 24 divisors (see below), whose sum is σ = 427602096. Its totient is φ = 68967840.

The previous prime is 201156541. The next prime is 201156583. The reversal of 201156550 is 55651102.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

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 11 ways as a sum of consecutive naturals, for example, 287017 + ... + 287716.

It is an arithmetic number, because the mean of its divisors is an integer number (17816754).

Almost surely, 2^201156550 is an apocalyptic number.

201156550 is an abundant number, since it is smaller than the sum of its proper divisors (226445546).

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

201156550 is a wasteful number, since it uses less digits than its factorization.

201156550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 574752 (or 574747 counting only the distinct ones).

The product of its (nonzero) digits is 1500, while the sum is 25.

The square root of 201156550 is about 14182.9668969507. The cubic root of 201156550 is about 585.9286392853.

The spelling of 201156550 in words is "two hundred one million, one hundred fifty-six thousand, five hundred fifty".