261004739 has 2 divisors, whose sum is σ = 261004740. Its totient is φ = 261004738.

The previous prime is 261004699. The next prime is 261004741. The reversal of 261004739 is 937400162.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-261004739 is a prime.

Together with 261004741, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (261004769) 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, 130502369 + 130502370.

It is an arithmetic number, because the mean of its divisors is an integer number (130502370).

Almost surely, 2^261004739 is an apocalyptic number.

261004739 is a deficient number, since it is larger than the sum of its proper divisors (1).

261004739 is an equidigital number, since it uses as much as digits as its factorization.

261004739 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9072, while the sum is 32.

The square root of 261004739 is about 16155.6410891057. The cubic root of 261004739 is about 639.0715206858.

The spelling of 261004739 in words is "two hundred sixty-one million, four thousand, seven hundred thirty-nine".