261513347 has 2 divisors, whose sum is σ = 261513348. Its totient is φ = 261513346.

The previous prime is 261513331. The next prime is 261513361. The reversal of 261513347 is 743315162.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 261513347 - 2⁴ = 261513331 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (261513367) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130756673 + 130756674.

It is an arithmetic number, because the mean of its divisors is an integer number (130756674).

Almost surely, 2^261513347 is an apocalyptic number.

261513347 is a deficient number, since it is larger than the sum of its proper divisors (1).

261513347 is an equidigital number, since it uses as much as digits as its factorization.

261513347 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15120, while the sum is 32.

The square root of 261513347 is about 16171.3743077080. The cubic root of 261513347 is about 639.4863611587.

The spelling of 261513347 in words is "two hundred sixty-one million, five hundred thirteen thousand, three hundred forty-seven".