261920041 has 2 divisors, whose sum is σ = 261920042. Its totient is φ = 261920040.

The previous prime is 261920033. The next prime is 261920047. The reversal of 261920041 is 140029162.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 261760041 + 160000 = 16179^2 + 400^2 .

It is a cyclic number.

It is not a de Polignac number, because 261920041 - 2³ = 261920033 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 261919988 and 261920015.

It is not a weakly prime, because it can be changed into another prime (261920047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130960020 + 130960021.

It is an arithmetic number, because the mean of its divisors is an integer number (130960021).

Almost surely, 2^261920041 is an apocalyptic number.

It is an amenable number.

261920041 is a deficient number, since it is larger than the sum of its proper divisors (1).

261920041 is an equidigital number, since it uses as much as digits as its factorization.

261920041 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 261920041 is about 16183.9439260027. The cubic root of 261920041 is about 639.8176897713.

The spelling of 261920041 in words is "two hundred sixty-one million, nine hundred twenty thousand, forty-one".