275705921 has 4 divisors (see below), whose sum is σ = 275867844. Its totient is φ = 275544000.

The previous prime is 275705887. The next prime is 275705957. The reversal of 275705921 is 129507572.

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 107640625 + 168065296 = 10375^2 + 12964^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-275705921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (275705021) 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, 78380 + ... + 81821.

It is an arithmetic number, because the mean of its divisors is an integer number (68966961).

Almost surely, 2^275705921 is an apocalyptic number.

It is an amenable number.

275705921 is a deficient number, since it is larger than the sum of its proper divisors (161923).

275705921 is a wasteful number, since it uses less digits than its factorization.

275705921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161922.

The product of its (nonzero) digits is 44100, while the sum is 38.

The square root of 275705921 is about 16604.3946291336. The cubic root of 275705921 is about 650.8516812059.

The spelling of 275705921 in words is "two hundred seventy-five million, seven hundred five thousand, nine hundred twenty-one".