261347573 has 2 divisors, whose sum is σ = 261347574. Its totient is φ = 261347572.

The previous prime is 261347533. The next prime is 261347587. The reversal of 261347573 is 375743162.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 214534609 + 46812964 = 14647^2 + 6842^2 .

It is a cyclic number.

It is not a de Polignac number, because 261347573 - 2⁶ = 261347509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261347533) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130673786 + 130673787.

It is an arithmetic number, because the mean of its divisors is an integer number (130673787).

Almost surely, 2^261347573 is an apocalyptic number.

It is an amenable number.

261347573 is a deficient number, since it is larger than the sum of its proper divisors (1).

261347573 is an equidigital number, since it uses as much as digits as its factorization.

261347573 is an evil number, because the sum of its binary digits is even.

The product of its digits is 105840, while the sum is 38.

The square root of 261347573 is about 16166.2479567771. The cubic root of 261347573 is about 639.3512085668.

The spelling of 261347573 in words is "two hundred sixty-one million, three hundred forty-seven thousand, five hundred seventy-three".