201606651 has 12 divisors (see below), whose sum is σ = 301995512. Its totient is φ = 134404272.

The previous prime is 201606649. The next prime is 201606677. The reversal of 201606651 is 156606102.

It is a happy number.

201606651 is a `hidden beast` number, since 2 + 0 + 1 + 6 + 0 + 6 + 651 = 666.

It is not a de Polignac number, because 201606651 - 2¹ = 201606649 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (201606631) 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 11 ways as a sum of consecutive naturals, for example, 414586 + ... + 415071.

Almost surely, 2^201606651 is an apocalyptic number.

201606651 is a deficient number, since it is larger than the sum of its proper divisors (100388861).

201606651 is an frugal number, since it uses more digits than its factorization.

201606651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 829672 (or 829660 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 201606651 is about 14198.8256908802. The cubic root of 201606651 is about 586.3653316830.

The spelling of 201606651 in words is "two hundred one million, six hundred six thousand, six hundred fifty-one".