200891989 has 2 divisors, whose sum is σ = 200891990. Its totient is φ = 200891988.

The previous prime is 200891987. The next prime is 200891993. The reversal of 200891989 is 989198002.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 186322500 + 14569489 = 13650^2 + 3817^2 .

It is a cyclic number.

It is not a de Polignac number, because 200891989 - 2¹ = 200891987 is a prime.

It is a super-2 number, since 2×200891989² = 80715182488752242, which contains 22 as substring.

Together with 200891987, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (200891987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100445994 + 100445995.

It is an arithmetic number, because the mean of its divisors is an integer number (100445995).

Almost surely, 2^200891989 is an apocalyptic number.

It is an amenable number.

200891989 is a deficient number, since it is larger than the sum of its proper divisors (1).

200891989 is an equidigital number, since it uses as much as digits as its factorization.

200891989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 93312, while the sum is 46.

The square root of 200891989 is about 14173.6371126116. The cubic root of 200891989 is about 585.6716555670.

The spelling of 200891989 in words is "two hundred million, eight hundred ninety-one thousand, nine hundred eighty-nine".