207561121 has 2 divisors, whose sum is σ = 207561122. Its totient is φ = 207561120.

The previous prime is 207561097. The next prime is 207561169. The reversal of 207561121 is 121165702.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 204175521 + 3385600 = 14289^2 + 1840^2 .

It is a cyclic number.

It is not a de Polignac number, because 207561121 - 2⁹ = 207560609 is a prime.

It is not a weakly prime, because it can be changed into another prime (207561191) 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, 103780560 + 103780561.

It is an arithmetic number, because the mean of its divisors is an integer number (103780561).

Almost surely, 2^207561121 is an apocalyptic number.

It is an amenable number.

207561121 is a deficient number, since it is larger than the sum of its proper divisors (1).

207561121 is an equidigital number, since it uses as much as digits as its factorization.

207561121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 840, while the sum is 25.

The square root of 207561121 is about 14406.9816755627. The cubic root of 207561121 is about 592.0821967451.

The spelling of 207561121 in words is "two hundred seven million, five hundred sixty-one thousand, one hundred twenty-one".