261290201 has 2 divisors, whose sum is σ = 261290202. Its totient is φ = 261290200.

The previous prime is 261290179. The next prime is 261290213. The reversal of 261290201 is 102092162.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 162307600 + 98982601 = 12740^2 + 9949^2 .

It is a cyclic number.

It is not a de Polignac number, because 261290201 - 2¹⁸ = 261028057 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (261292201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130645100 + 130645101.

It is an arithmetic number, because the mean of its divisors is an integer number (130645101).

Almost surely, 2^261290201 is an apocalyptic number.

It is an amenable number.

261290201 is a deficient number, since it is larger than the sum of its proper divisors (1).

261290201 is an equidigital number, since it uses as much as digits as its factorization.

261290201 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 261290201 is about 16164.4734216738. The cubic root of 261290201 is about 639.3044208841.

The spelling of 261290201 in words is "two hundred sixty-one million, two hundred ninety thousand, two hundred one".