209892961 has 2 divisors, whose sum is σ = 209892962. Its totient is φ = 209892960.

The previous prime is 209892937. The next prime is 209892979. The reversal of 209892961 is 169298902.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 209699361 + 193600 = 14481^2 + 440^2 .

It is a cyclic number.

It is not a de Polignac number, because 209892961 - 2⁷ = 209892833 is a prime.

It is not a weakly prime, because it can be changed into another prime (209892901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104946480 + 104946481.

It is an arithmetic number, because the mean of its divisors is an integer number (104946481).

Almost surely, 2^209892961 is an apocalyptic number.

It is an amenable number.

209892961 is a deficient number, since it is larger than the sum of its proper divisors (1).

209892961 is an equidigital number, since it uses as much as digits as its factorization.

209892961 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 139968, while the sum is 46.

The square root of 209892961 is about 14487.6830790848. The cubic root of 209892961 is about 594.2911889921.

It can be divided in two parts, 2098 and 92961, that added together give a palindrome (95059).

The spelling of 209892961 in words is "two hundred nine million, eight hundred ninety-two thousand, nine hundred sixty-one".