260831505 has 16 divisors (see below), whose sum is σ = 455269824. Its totient is φ = 126463680.

The previous prime is 260831471. The next prime is 260831509. The reversal of 260831505 is 505138062.

It is a de Polignac number, because none of the positive numbers 2^k-260831505 is a prime.

It is a super-3 number, since 3×260831505³ (a number of 26 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (260831509) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 790234 + ... + 790563.

It is an arithmetic number, because the mean of its divisors is an integer number (28454364).

Almost surely, 2^260831505 is an apocalyptic number.

It is an amenable number.

260831505 is a deficient number, since it is larger than the sum of its proper divisors (194438319).

260831505 is a wasteful number, since it uses less digits than its factorization.

260831505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1580816.

The product of its (nonzero) digits is 7200, while the sum is 30.

The square root of 260831505 is about 16150.2787901633. The cubic root of 260831505 is about 638.9301012636.

Adding to 260831505 its reverse (505138062), we get a palindrome (765969567).

The spelling of 260831505 in words is "two hundred sixty million, eight hundred thirty-one thousand, five hundred five".