201651889 has 2 divisors, whose sum is σ = 201651890. Its totient is φ = 201651888.

The previous prime is 201651881. The next prime is 201651979. The reversal of 201651889 is 988156102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 172134400 + 29517489 = 13120^2 + 5433^2 .

It is a cyclic number.

It is not a de Polignac number, because 201651889 - 2³ = 201651881 is a prime.

It is not a weakly prime, because it can be changed into another prime (201651881) 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 as a sum of consecutive naturals, namely, 100825944 + 100825945.

It is an arithmetic number, because the mean of its divisors is an integer number (100825945).

Almost surely, 2^201651889 is an apocalyptic number.

It is an amenable number.

201651889 is a deficient number, since it is larger than the sum of its proper divisors (1).

201651889 is an equidigital number, since it uses as much as digits as its factorization.

201651889 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 34560, while the sum is 40.

The square root of 201651889 is about 14200.4186205900. The cubic root of 201651889 is about 586.4091860746.

The spelling of 201651889 in words is "two hundred one million, six hundred fifty-one thousand, eight hundred eighty-nine".