201551642 has 8 divisors (see below), whose sum is σ = 302442336. Its totient is φ = 100737532.

The previous prime is 201551641. The next prime is 201551671. The reversal of 201551642 is 246155102.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (201551641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12038 + ... + 23409.

It is an arithmetic number, because the mean of its divisors is an integer number (37805292).

Almost surely, 2^201551642 is an apocalyptic number.

201551642 is a deficient number, since it is larger than the sum of its proper divisors (100890694).

201551642 is a wasteful number, since it uses less digits than its factorization.

201551642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38292.

The product of its (nonzero) digits is 2400, while the sum is 26.

The square root of 201551642 is about 14196.8884619131. Note that the first 3 decimals coincide. The cubic root of 201551642 is about 586.3119962987.

The spelling of 201551642 in words is "two hundred one million, five hundred fifty-one thousand, six hundred forty-two".