260663981 has 4 divisors (see below), whose sum is σ = 260739552. Its totient is φ = 260588412.

The previous prime is 260663951. The next prime is 260663987. The reversal of 260663981 is 189366062.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-260663981 is a prime.

It is a super-2 number, since 2×260663981² = 135891421981536722, 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 (260663987) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32351 + ... + 39596.

It is an arithmetic number, because the mean of its divisors is an integer number (65184888).

Almost surely, 2^260663981 is an apocalyptic number.

It is an amenable number.

260663981 is a deficient number, since it is larger than the sum of its proper divisors (75571).

260663981 is an equidigital number, since it uses as much as digits as its factorization.

260663981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75570.

The product of its (nonzero) digits is 93312, while the sum is 41.

The square root of 260663981 is about 16145.0915451105. The cubic root of 260663981 is about 638.7932836275.

The spelling of 260663981 in words is "two hundred sixty million, six hundred sixty-three thousand, nine hundred eighty-one".