261489896 has 16 divisors (see below), whose sum is σ = 491027940. Its totient is φ = 130549120.

The previous prime is 261489881. The next prime is 261489941. The reversal of 261489896 is 698984162.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 235622500 + 25867396 = 15350^2 + 5086^2 .

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 18725 + ... + 29556.

Almost surely, 2^261489896 is an apocalyptic number.

It is an amenable number.

261489896 is a deficient number, since it is larger than the sum of its proper divisors (229538044).

261489896 is a wasteful number, since it uses less digits than its factorization.

261489896 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48964 (or 48960 counting only the distinct ones).

The product of its digits is 1492992, while the sum is 53.

The square root of 261489896 is about 16170.6492139308. The cubic root of 261489896 is about 639.4672454448.

The spelling of 261489896 in words is "two hundred sixty-one million, four hundred eighty-nine thousand, eight hundred ninety-six".