261602843 has 2 divisors, whose sum is σ = 261602844. Its totient is φ = 261602842.

The previous prime is 261602821. The next prime is 261602857. The reversal of 261602843 is 348206162.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 261602843 - 2⁶ = 261602779 is a prime.

It is equal to p_14278703 and since 261602843 and 14278703 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (261604843) 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, 130801421 + 130801422.

It is an arithmetic number, because the mean of its divisors is an integer number (130801422).

Almost surely, 2^261602843 is an apocalyptic number.

261602843 is a deficient number, since it is larger than the sum of its proper divisors (1).

261602843 is an equidigital number, since it uses as much as digits as its factorization.

261602843 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13824, while the sum is 32.

The square root of 261602843 is about 16174.1411827645. The cubic root of 261602843 is about 639.5593019150.

The spelling of 261602843 in words is "two hundred sixty-one million, six hundred two thousand, eight hundred forty-three".