262561861 has 2 divisors, whose sum is σ = 262561862. Its totient is φ = 262561860.

The previous prime is 262561823. The next prime is 262561883. The reversal of 262561861 is 168165262.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 175960225 + 86601636 = 13265^2 + 9306^2 .

It is a cyclic number.

It is not a de Polignac number, because 262561861 - 2⁹ = 262561349 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 262561861.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (262561891) 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, 131280930 + 131280931.

It is an arithmetic number, because the mean of its divisors is an integer number (131280931).

Almost surely, 2^262561861 is an apocalyptic number.

It is an amenable number.

262561861 is a deficient number, since it is larger than the sum of its proper divisors (1).

262561861 is an equidigital number, since it uses as much as digits as its factorization.

262561861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 34560, while the sum is 37.

The square root of 262561861 is about 16203.7607054659. The cubic root of 262561861 is about 640.3398756275.

The spelling of 262561861 in words is "two hundred sixty-two million, five hundred sixty-one thousand, eight hundred sixty-one".