261513512 has 32 divisors (see below), whose sum is σ = 529294080. Its totient is φ = 120415680.

The previous prime is 261513509. The next prime is 261513517. The reversal of 261513512 is 215315162.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is not an unprimeable number, because it can be changed into a prime (261513517) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45437 + ... + 50867.

It is an arithmetic number, because the mean of its divisors is an integer number (16540440).

Almost surely, 2^261513512 is an apocalyptic number.

It is an amenable number.

261513512 is an abundant number, since it is smaller than the sum of its proper divisors (267780568).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

261513512 is a wasteful number, since it uses less digits than its factorization.

261513512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5913 (or 5909 counting only the distinct ones).

The product of its digits is 1800, while the sum is 26.

The square root of 261513512 is about 16171.3794093145. The cubic root of 261513512 is about 639.4864956518.

Adding to 261513512 its reverse (215315162), we get a palindrome (476828674).

The spelling of 261513512 in words is "two hundred sixty-one million, five hundred thirteen thousand, five hundred twelve".