261775043 has 2 divisors, whose sum is σ = 261775044. Its totient is φ = 261775042.

The previous prime is 261775039. The next prime is 261775069. The reversal of 261775043 is 340577162.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 261775043 - 2² = 261775039 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 261774994 and 261775012.

It is not a weakly prime, because it can be changed into another prime (261775093) 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, 130887521 + 130887522.

It is an arithmetic number, because the mean of its divisors is an integer number (130887522).

Almost surely, 2^261775043 is an apocalyptic number.

261775043 is a deficient number, since it is larger than the sum of its proper divisors (1).

261775043 is an equidigital number, since it uses as much as digits as its factorization.

261775043 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 35280, while the sum is 35.

The square root of 261775043 is about 16179.4636190450. The cubic root of 261775043 is about 639.6996010475.

The spelling of 261775043 in words is "two hundred sixty-one million, seven hundred seventy-five thousand, forty-three".