261822923 has 2 divisors, whose sum is σ = 261822924. Its totient is φ = 261822922.

The previous prime is 261822889. The next prime is 261822971. The reversal of 261822923 is 329228162.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 261822923 - 2¹⁶ = 261757387 is a prime.

It is not a weakly prime, because it can be changed into another prime (261822523) 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, 130911461 + 130911462.

It is an arithmetic number, because the mean of its divisors is an integer number (130911462).

Almost surely, 2^261822923 is an apocalyptic number.

261822923 is a deficient number, since it is larger than the sum of its proper divisors (1).

261822923 is an equidigital number, since it uses as much as digits as its factorization.

261822923 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20736, while the sum is 35.

The square root of 261822923 is about 16180.9432048938. The cubic root of 261822923 is about 639.7386001176.

The spelling of 261822923 in words is "two hundred sixty-one million, eight hundred twenty-two thousand, nine hundred twenty-three".