261602867 has 2 divisors, whose sum is σ = 261602868. Its totient is φ = 261602866.

The previous prime is 261602857. The next prime is 261602899. The reversal of 261602867 is 768206162.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-261602867 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 261602867.

It is not a weakly prime, because it can be changed into another prime (261602857) 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, 130801433 + 130801434.

It is an arithmetic number, because the mean of its divisors is an integer number (130801434).

Almost surely, 2^261602867 is an apocalyptic number.

261602867 is a deficient number, since it is larger than the sum of its proper divisors (1).

261602867 is an equidigital number, since it uses as much as digits as its factorization.

261602867 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48384, while the sum is 38.

The square root of 261602867 is about 16174.1419246895. The cubic root of 261602867 is about 639.5593214732.

The spelling of 261602867 in words is "two hundred sixty-one million, six hundred two thousand, eight hundred sixty-seven".