261546797 has 2 divisors, whose sum is σ = 261546798. Its totient is φ = 261546796.

The previous prime is 261546781. The next prime is 261546827. The reversal of 261546797 is 797645162.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 145467721 + 116079076 = 12061^2 + 10774^2 .

It is a cyclic number.

It is not a de Polignac number, because 261546797 - 2⁴ = 261546781 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261546097) 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, 130773398 + 130773399.

It is an arithmetic number, because the mean of its divisors is an integer number (130773399).

Almost surely, 2^261546797 is an apocalyptic number.

It is an amenable number.

261546797 is a deficient number, since it is larger than the sum of its proper divisors (1).

261546797 is an equidigital number, since it uses as much as digits as its factorization.

261546797 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 635040, while the sum is 47.

The square root of 261546797 is about 16172.4085095573. The cubic root of 261546797 is about 639.5136254227.

The spelling of 261546797 in words is "two hundred sixty-one million, five hundred forty-six thousand, seven hundred ninety-seven".