201091655 has 8 divisors (see below), whose sum is σ = 249631200. Its totient is φ = 155325856.

The previous prime is 201091621. The next prime is 201091663. The reversal of 201091655 is 556190102.

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

It is not a de Polignac number, because 201091655 - 2⁶ = 201091591 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 693275 + ... + 693564.

It is an arithmetic number, because the mean of its divisors is an integer number (31203900).

Almost surely, 2^201091655 is an apocalyptic number.

201091655 is a deficient number, since it is larger than the sum of its proper divisors (48539545).

201091655 is a wasteful number, since it uses less digits than its factorization.

201091655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1386873.

The product of its (nonzero) digits is 2700, while the sum is 29.

The square root of 201091655 is about 14180.6789329707. The cubic root of 201091655 is about 585.8656238068.

The spelling of 201091655 in words is "two hundred one million, ninety-one thousand, six hundred fifty-five".