261061012 has 12 divisors (see below), whose sum is σ = 458033940. Its totient is φ = 130194176.

The previous prime is 261061001. The next prime is 261061039. The reversal of 261061012 is 210160162.

It can be written as a sum of positive squares in 2 ways, for example, as 39765636 + 221295376 = 6306^2 + 14876^2 .

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 in 3 ways as a sum of consecutive naturals, for example, 82333 + ... + 85444.

It is an arithmetic number, because the mean of its divisors is an integer number (38169495).

Almost surely, 2^261061012 is an apocalyptic number.

It is an amenable number.

261061012 is a deficient number, since it is larger than the sum of its proper divisors (196972928).

261061012 is a wasteful number, since it uses less digits than its factorization.

261061012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168170 (or 168168 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 261061012 is about 16157.3825850600. The cubic root of 261061012 is about 639.1174456341.

The spelling of 261061012 in words is "two hundred sixty-one million, sixty-one thousand, twelve".