261456487 has 2 divisors, whose sum is σ = 261456488. Its totient is φ = 261456486.

The previous prime is 261456463. The next prime is 261456497. The reversal of 261456487 is 784654162.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 261456487 - 2¹¹ = 261454439 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261456497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130728243 + 130728244.

It is an arithmetic number, because the mean of its divisors is an integer number (130728244).

Almost surely, 2^261456487 is an apocalyptic number.

261456487 is a deficient number, since it is larger than the sum of its proper divisors (1).

261456487 is an equidigital number, since it uses as much as digits as its factorization.

261456487 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 322560, while the sum is 43.

The square root of 261456487 is about 16169.6161673677. The cubic root of 261456487 is about 639.4400106498.

The spelling of 261456487 in words is "two hundred sixty-one million, four hundred fifty-six thousand, four hundred eighty-seven".