260639989 has 2 divisors, whose sum is σ = 260639990. Its totient is φ = 260639988.

The previous prime is 260639987. The next prime is 260639999. The reversal of 260639989 is 989936062.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 257345764 + 3294225 = 16042^2 + 1815^2 .

It is a cyclic number.

It is not a de Polignac number, because 260639989 - 2¹ = 260639987 is a prime.

Together with 260639987, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (260639987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130319994 + 130319995.

It is an arithmetic number, because the mean of its divisors is an integer number (130319995).

Almost surely, 2^260639989 is an apocalyptic number.

It is an amenable number.

260639989 is a deficient number, since it is larger than the sum of its proper divisors (1).

260639989 is an equidigital number, since it uses as much as digits as its factorization.

260639989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1259712, while the sum is 52.

The square root of 260639989 is about 16144.3485158120. The cubic root of 260639989 is about 638.7736844503.

The spelling of 260639989 in words is "two hundred sixty million, six hundred thirty-nine thousand, nine hundred eighty-nine".