261240316 has 6 divisors (see below), whose sum is σ = 457170560. Its totient is φ = 130620156.

The previous prime is 261240289. The next prime is 261240347. The reversal of 261240316 is 613042162.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32655036 + ... + 32655043.

Almost surely, 2^261240316 is an apocalyptic number.

It is an amenable number.

261240316 is a deficient number, since it is larger than the sum of its proper divisors (195930244).

261240316 is a wasteful number, since it uses less digits than its factorization.

261240316 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65310083 (or 65310081 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 261240316 is about 16162.9303036300. The cubic root of 261240316 is about 639.2637333896.

Adding to 261240316 its reverse (613042162), we get a palindrome (874282478).

The spelling of 261240316 in words is "two hundred sixty-one million, two hundred forty thousand, three hundred sixteen".