260531257 has 4 divisors (see below), whose sum is σ = 297750016. Its totient is φ = 223312500.

The previous prime is 260531251. The next prime is 260531263. The reversal of 260531257 is 752135062.

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 an interprime number because it is at equal distance from previous prime (260531251) and next prime (260531263).

It is a cyclic number.

It is not a de Polignac number, because 260531257 - 2⁷ = 260531129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (260531251) 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, 18609369 + ... + 18609382.

It is an arithmetic number, because the mean of its divisors is an integer number (74437504).

Almost surely, 2^260531257 is an apocalyptic number.

It is an amenable number.

260531257 is a deficient number, since it is larger than the sum of its proper divisors (37218759).

260531257 is an equidigital number, since it uses as much as digits as its factorization.

260531257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37218758.

The product of its (nonzero) digits is 12600, while the sum is 31.

The square root of 260531257 is about 16140.9806703310. The cubic root of 260531257 is about 638.6848456897.

The spelling of 260531257 in words is "two hundred sixty million, five hundred thirty-one thousand, two hundred fifty-seven".