201961889 has 2 divisors, whose sum is σ = 201961890. Its totient is φ = 201961888.

The previous prime is 201961847. The next prime is 201961913. The reversal of 201961889 is 988169102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 143592289 + 58369600 = 11983^2 + 7640^2 .

It is a cyclic number.

It is not a de Polignac number, because 201961889 - 2¹² = 201957793 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (201961489) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100980944 + 100980945.

It is an arithmetic number, because the mean of its divisors is an integer number (100980945).

Almost surely, 2^201961889 is an apocalyptic number.

It is an amenable number.

201961889 is a deficient number, since it is larger than the sum of its proper divisors (1).

201961889 is an equidigital number, since it uses as much as digits as its factorization.

201961889 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 62208, while the sum is 44.

The square root of 201961889 is about 14211.3296000058. The cubic root of 201961889 is about 586.7095283696.

The spelling of 201961889 in words is "two hundred one million, nine hundred sixty-one thousand, eight hundred eighty-nine".