261344597 has 2 divisors, whose sum is σ = 261344598. Its totient is φ = 261344596.

The previous prime is 261344543. The next prime is 261344617. The reversal of 261344597 is 795443162.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 261339556 + 5041 = 16166^2 + 71^2 .

It is a cyclic number.

It is not a de Polignac number, because 261344597 - 2¹⁰ = 261343573 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261304597) 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, 130672298 + 130672299.

It is an arithmetic number, because the mean of its divisors is an integer number (130672299).

Almost surely, 2^261344597 is an apocalyptic number.

It is an amenable number.

261344597 is a deficient number, since it is larger than the sum of its proper divisors (1).

261344597 is an equidigital number, since it uses as much as digits as its factorization.

261344597 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 181440, while the sum is 41.

The square root of 261344597 is about 16166.1559128941. The cubic root of 261344597 is about 639.3487817648.

The spelling of 261344597 in words is "two hundred sixty-one million, three hundred forty-four thousand, five hundred ninety-seven".