260980991 has 4 divisors (see below), whose sum is σ = 276332832. Its totient is φ = 245629152.

The previous prime is 260980963. The next prime is 260980999. The reversal of 260980991 is 199089062.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 260980991 - 2⁶ = 260980927 is a prime.

It is a super-2 number, since 2×260980991² = 136222155326684162, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (260980999) 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 in 3 ways as a sum of consecutive naturals, for example, 7675895 + ... + 7675928.

It is an arithmetic number, because the mean of its divisors is an integer number (69083208).

Almost surely, 2^260980991 is an apocalyptic number.

260980991 is a deficient number, since it is larger than the sum of its proper divisors (15351841).

260980991 is a wasteful number, since it uses less digits than its factorization.

260980991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15351840.

The product of its (nonzero) digits is 69984, while the sum is 44.

The square root of 260980991 is about 16154.9060969106. The cubic root of 260980991 is about 639.0521377289.

The spelling of 260980991 in words is "two hundred sixty million, nine hundred eighty thousand, nine hundred ninety-one".