260249861 has 4 divisors (see below), whose sum is σ = 263915424. Its totient is φ = 256584300.

The previous prime is 260249833. The next prime is 260249863. The reversal of 260249861 is 168942062.

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-260249861 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (260249863) 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, 1832675 + ... + 1832816.

It is an arithmetic number, because the mean of its divisors is an integer number (65978856).

Almost surely, 2^260249861 is an apocalyptic number.

It is an amenable number.

260249861 is a deficient number, since it is larger than the sum of its proper divisors (3665563).

260249861 is an equidigital number, since it uses as much as digits as its factorization.

260249861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3665562.

The product of its (nonzero) digits is 41472, while the sum is 38.

The square root of 260249861 is about 16132.2614967648. The cubic root of 260249861 is about 638.4548181333.

The spelling of 260249861 in words is "two hundred sixty million, two hundred forty-nine thousand, eight hundred sixty-one".