275531661 has 12 divisors (see below), whose sum is σ = 399135100. Its totient is φ = 183159360.

The previous prime is 275531621. The next prime is 275531681. The reversal of 275531661 is 166135572.

It can be written as a sum of positive squares in 2 ways, for example, as 143856036 + 131675625 = 11994^2 + 11475^2 .

It is not a de Polignac number, because 275531661 - 2¹⁰ = 275530637 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (275531611) 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 11 ways as a sum of consecutive naturals, for example, 40720 + ... + 47001.

Almost surely, 2^275531661 is an apocalyptic number.

It is an amenable number.

275531661 is a deficient number, since it is larger than the sum of its proper divisors (123603439).

275531661 is a wasteful number, since it uses less digits than its factorization.

275531661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88076 (or 88073 counting only the distinct ones).

The product of its digits is 37800, while the sum is 36.

The square root of 275531661 is about 16599.1463937156. The cubic root of 275531661 is about 650.7145286472.

The spelling of 275531661 in words is "two hundred seventy-five million, five hundred thirty-one thousand, six hundred sixty-one".