260631521 has 2 divisors, whose sum is σ = 260631522. Its totient is φ = 260631520.

The previous prime is 260631499. The next prime is 260631523. The reversal of 260631521 is 125136062.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 257153296 + 3478225 = 16036^2 + 1865^2 .

It is a cyclic number.

It is not a de Polignac number, because 260631521 - 2⁶ = 260631457 is a prime.

Together with 260631523, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (260631523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130315760 + 130315761.

It is an arithmetic number, because the mean of its divisors is an integer number (130315761).

Almost surely, 2^260631521 is an apocalyptic number.

It is an amenable number.

260631521 is a deficient number, since it is larger than the sum of its proper divisors (1).

260631521 is an equidigital number, since it uses as much as digits as its factorization.

260631521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 260631521 is about 16144.0862547250. The cubic root of 260631521 is about 638.7667666142.

Adding to 260631521 its reverse (125136062), we get a palindrome (385767583).

The spelling of 260631521 in words is "two hundred sixty million, six hundred thirty-one thousand, five hundred twenty-one".