261441508 has 12 divisors (see below), whose sum is σ = 465277680. Its totient is φ = 128505032.

The previous prime is 261441491. The next prime is 261441511. The reversal of 261441508 is 805144162.

It is a self number, because there is not a number n which added to its sum of digits gives 261441508.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 553666 + ... + 554137.

It is an arithmetic number, because the mean of its divisors is an integer number (38773140).

Almost surely, 2^261441508 is an apocalyptic number.

It is an amenable number.

261441508 is a deficient number, since it is larger than the sum of its proper divisors (203836172).

261441508 is a wasteful number, since it uses less digits than its factorization.

261441508 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1107866 (or 1107864 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 31.

The square root of 261441508 is about 16169.1529771970. The cubic root of 261441508 is about 639.4277991152.

The spelling of 261441508 in words is "two hundred sixty-one million, four hundred forty-one thousand, five hundred eight".