261600487 has 2 divisors, whose sum is σ = 261600488. Its totient is φ = 261600486.

The previous prime is 261600473. The next prime is 261600491. The reversal of 261600487 is 784006162.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 261600487 - 2⁷ = 261600359 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261600407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130800243 + 130800244.

It is an arithmetic number, because the mean of its divisors is an integer number (130800244).

Almost surely, 2^261600487 is an apocalyptic number.

261600487 is a deficient number, since it is larger than the sum of its proper divisors (1).

261600487 is an equidigital number, since it uses as much as digits as its factorization.

261600487 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16128, while the sum is 34.

The square root of 261600487 is about 16174.0683502946. The cubic root of 261600487 is about 639.5573819483.

The spelling of 261600487 in words is "two hundred sixty-one million, six hundred thousand, four hundred eighty-seven".