260721887 has 2 divisors, whose sum is σ = 260721888. Its totient is φ = 260721886.

The previous prime is 260721863. The next prime is 260721889. The reversal of 260721887 is 788127062.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 260721887 - 2¹⁴ = 260705503 is a prime.

It is a super-3 number, since 3×260721887³ (a number of 26 digits) contains 333 as substring.

Together with 260721889, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (260721889) 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, 130360943 + 130360944.

It is an arithmetic number, because the mean of its divisors is an integer number (130360944).

Almost surely, 2^260721887 is an apocalyptic number.

260721887 is a deficient number, since it is larger than the sum of its proper divisors (1).

260721887 is an equidigital number, since it uses as much as digits as its factorization.

260721887 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 75264, while the sum is 41.

The square root of 260721887 is about 16146.8847459812. The cubic root of 260721887 is about 638.8405823567.

The spelling of 260721887 in words is "two hundred sixty million, seven hundred twenty-one thousand, eight hundred eighty-seven".