261347 has 2 divisors, whose sum is σ = 261348. Its totient is φ = 261346.

The previous prime is 261337. The next prime is 261353. The reversal of 261347 is 743162.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-261347 is a prime.

It is a zygodrome in base 2.

It is not a weakly prime, because it can be changed into another prime (261337) 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, 130673 + 130674.

It is an arithmetic number, because the mean of its divisors is an integer number (130674).

2²⁶¹³⁴⁷ is an apocalyptic number.

261347 is a deficient number, since it is larger than the sum of its proper divisors (1).

261347 is an equidigital number, since it uses as much as digits as its factorization.

261347 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1008, while the sum is 23.

The square root of 261347 is about 511.2210872020. The cubic root of 261347 is about 63.9350741311.

The spelling of 261347 in words is "two hundred sixty-one thousand, three hundred forty-seven".