261337823 has 2 divisors, whose sum is σ = 261337824. Its totient is φ = 261337822.

The previous prime is 261337793. The next prime is 261337841. The reversal of 261337823 is 328733162.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 261337823 - 2¹⁴ = 261321439 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261337873) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130668911 + 130668912.

It is an arithmetic number, because the mean of its divisors is an integer number (130668912).

Almost surely, 2^261337823 is an apocalyptic number.

261337823 is a deficient number, since it is larger than the sum of its proper divisors (1).

261337823 is an equidigital number, since it uses as much as digits as its factorization.

261337823 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36288, while the sum is 35.

The square root of 261337823 is about 16165.9463997627. The cubic root of 261337823 is about 639.3432577860.

The spelling of 261337823 in words is "two hundred sixty-one million, three hundred thirty-seven thousand, eight hundred twenty-three".