201136661 has 4 divisors (see below), whose sum is σ = 219421824. Its totient is φ = 182851500.

The previous prime is 201136657. The next prime is 201136667. The reversal of 201136661 is 166631102.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 201136661 - 2² = 201136657 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 201136661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201136667) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9142565 + ... + 9142586.

It is an arithmetic number, because the mean of its divisors is an integer number (54855456).

Almost surely, 2^201136661 is an apocalyptic number.

It is an amenable number.

201136661 is a deficient number, since it is larger than the sum of its proper divisors (18285163).

201136661 is a wasteful number, since it uses less digits than its factorization.

201136661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18285162.

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 201136661 is about 14182.2657216680. The cubic root of 201136661 is about 585.9093277610.

Adding to 201136661 its reverse (166631102), we get a palindrome (367767763).

The spelling of 201136661 in words is "two hundred one million, one hundred thirty-six thousand, six hundred sixty-one".