261315701 has 2 divisors, whose sum is σ = 261315702. Its totient is φ = 261315700.

The previous prime is 261315689. The next prime is 261315737. The reversal of 261315701 is 107513162.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 227104900 + 34210801 = 15070^2 + 5849^2 .

It is a cyclic number.

It is not a de Polignac number, because 261315701 - 2¹⁴ = 261299317 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261315751) 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, 130657850 + 130657851.

It is an arithmetic number, because the mean of its divisors is an integer number (130657851).

Almost surely, 2^261315701 is an apocalyptic number.

It is an amenable number.

261315701 is a deficient number, since it is larger than the sum of its proper divisors (1).

261315701 is an equidigital number, since it uses as much as digits as its factorization.

261315701 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1260, while the sum is 26.

The square root of 261315701 is about 16165.2621692319. The cubic root of 261315701 is about 639.3252173425.

Adding to 261315701 its reverse (107513162), we get a palindrome (368828863).

The spelling of 261315701 in words is "two hundred sixty-one million, three hundred fifteen thousand, seven hundred one".