261458987 has 2 divisors, whose sum is σ = 261458988. Its totient is φ = 261458986.

The previous prime is 261458971. The next prime is 261458999. The reversal of 261458987 is 789854162.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 261458987 - 2⁴ = 261458971 is a prime.

It is not a weakly prime, because it can be changed into another prime (261458957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130729493 + 130729494.

It is an arithmetic number, because the mean of its divisors is an integer number (130729494).

Almost surely, 2^261458987 is an apocalyptic number.

261458987 is a deficient number, since it is larger than the sum of its proper divisors (1).

261458987 is an equidigital number, since it uses as much as digits as its factorization.

261458987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 967680, while the sum is 50.

The square root of 261458987 is about 16169.6934726667. The cubic root of 261458987 is about 639.4420487135.

The spelling of 261458987 in words is "two hundred sixty-one million, four hundred fifty-eight thousand, nine hundred eighty-seven".