275211661 has 4 divisors (see below), whose sum is σ = 282649852. Its totient is φ = 267773472.

The previous prime is 275211647. The next prime is 275211683. The reversal of 275211661 is 166112572.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 148986436 + 126225225 = 12206^2 + 11235^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-275211661 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 (275211641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3719040 + ... + 3719113.

It is an arithmetic number, because the mean of its divisors is an integer number (70662463).

Almost surely, 2^275211661 is an apocalyptic number.

It is an amenable number.

275211661 is a deficient number, since it is larger than the sum of its proper divisors (7438191).

275211661 is an equidigital number, since it uses as much as digits as its factorization.

275211661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7438190.

The product of its digits is 5040, while the sum is 31.

The square root of 275211661 is about 16589.5045435360. The cubic root of 275211661 is about 650.4625197225.

The spelling of 275211661 in words is "two hundred seventy-five million, two hundred eleven thousand, six hundred sixty-one".