201155691 has 8 divisors (see below), whose sum is σ = 292590144. Its totient is φ = 121912520.

The previous prime is 201155671. The next prime is 201155693. The reversal of 201155691 is 196551102.

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

It is a cyclic number.

It is not a de Polignac number, because 201155691 - 2⁵ = 201155659 is a prime.

It is a super-2 number, since 2×201155691² = 80927224043374962, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (201155693) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3047781 + ... + 3047846.

It is an arithmetic number, because the mean of its divisors is an integer number (36573768).

Almost surely, 2^201155691 is an apocalyptic number.

201155691 is a deficient number, since it is larger than the sum of its proper divisors (91434453).

201155691 is a wasteful number, since it uses less digits than its factorization.

201155691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6095641.

The product of its (nonzero) digits is 2700, while the sum is 30.

The square root of 201155691 is about 14182.9366141149. The cubic root of 201155691 is about 585.9278052526.

The spelling of 201155691 in words is "two hundred one million, one hundred fifty-five thousand, six hundred ninety-one".