275621 has 8 divisors (see below), whose sum is σ = 301824. Its totient is φ = 250560.

The previous prime is 275599. The next prime is 275623. The reversal of 275621 is 126572.

275621 = 73² + 74² + ... + 106².

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 275621 - 2¹⁸ = 13477 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 (275623) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 266 + ... + 788.

It is an arithmetic number, because the mean of its divisors is an integer number (37728).

2²⁷⁵⁶²¹ is an apocalyptic number.

It is an amenable number.

275621 is a deficient number, since it is larger than the sum of its proper divisors (26203).

275621 is a wasteful number, since it uses less digits than its factorization.

275621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 571.

The product of its digits is 840, while the sum is 23.

The square root of 275621 is about 524.9961904624. The cubic root of 275621 is about 65.0784850757.

The spelling of 275621 in words is "two hundred seventy-five thousand, six hundred twenty-one".