275115721 has 8 divisors (see below), whose sum is σ = 285364800. Its totient is φ = 264917520.

The previous prime is 275115707. The next prime is 275115773. The reversal of 275115721 is 127511572.

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 275115721 - 2⁵ = 275115689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (275115521) 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, 1525 + ... + 23506.

It is an arithmetic number, because the mean of its divisors is an integer number (35670600).

Almost surely, 2^275115721 is an apocalyptic number.

It is an amenable number.

275115721 is a deficient number, since it is larger than the sum of its proper divisors (10249079).

275115721 is a wasteful number, since it uses less digits than its factorization.

275115721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25439.

The product of its digits is 4900, while the sum is 31.

The square root of 275115721 is about 16586.6127042263. The cubic root of 275115721 is about 650.3869262358.

The spelling of 275115721 in words is "two hundred seventy-five million, one hundred fifteen thousand, seven hundred twenty-one".