261334501 has 2 divisors, whose sum is σ = 261334502. Its totient is φ = 261334500.

The previous prime is 261334471. The next prime is 261334517. The reversal of 261334501 is 105433162.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 133056225 + 128278276 = 11535^2 + 11326^2 .

It is a cyclic number.

It is not a de Polignac number, because 261334501 - 2⁷ = 261334373 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261334001) 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, 130667250 + 130667251.

It is an arithmetic number, because the mean of its divisors is an integer number (130667251).

Almost surely, 2^261334501 is an apocalyptic number.

It is an amenable number.

261334501 is a deficient number, since it is larger than the sum of its proper divisors (1).

261334501 is an equidigital number, since it uses as much as digits as its factorization.

261334501 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 261334501 is about 16165.8436525905. The cubic root of 261334501 is about 639.3405487671.

Adding to 261334501 its reverse (105433162), we get a palindrome (366767663).

The spelling of 261334501 in words is "two hundred sixty-one million, three hundred thirty-four thousand, five hundred one".