261334517 has 2 divisors, whose sum is σ = 261334518. Its totient is φ = 261334516.

The previous prime is 261334501. The next prime is 261334529. The reversal of 261334517 is 715433162.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 184579396 + 76755121 = 13586^2 + 8761^2 .

It is a cyclic number.

It is not a de Polignac number, because 261334517 - 2⁴ = 261334501 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261334537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130667258 + 130667259.

It is an arithmetic number, because the mean of its divisors is an integer number (130667259).

Almost surely, 2^261334517 is an apocalyptic number.

It is an amenable number.

261334517 is a deficient number, since it is larger than the sum of its proper divisors (1).

261334517 is an equidigital number, since it uses as much as digits as its factorization.

261334517 is an evil number, because the sum of its binary digits is even.

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

The square root of 261334517 is about 16165.8441474610. The cubic root of 261334517 is about 639.3405618148.

Adding to 261334517 its reverse (715433162), we get a palindrome (976767679).

The spelling of 261334517 in words is "two hundred sixty-one million, three hundred thirty-four thousand, five hundred seventeen".