275511721 has 2 divisors, whose sum is σ = 275511722. Its totient is φ = 275511720.

The previous prime is 275511701. The next prime is 275511727. The reversal of 275511721 is 127115572.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 154753600 + 120758121 = 12440^2 + 10989^2 .

It is a cyclic number.

It is not a de Polignac number, because 275511721 - 2⁵ = 275511689 is a prime.

It is not a weakly prime, because it can be changed into another prime (275511727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 137755860 + 137755861.

It is an arithmetic number, because the mean of its divisors is an integer number (137755861).

Almost surely, 2^275511721 is an apocalyptic number.

It is an amenable number.

275511721 is a deficient number, since it is larger than the sum of its proper divisors (1).

275511721 is an equidigital number, since it uses as much as digits as its factorization.

275511721 is an evil number, because the sum of its binary digits is even.

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

The square root of 275511721 is about 16598.5457495529. The cubic root of 275511721 is about 650.6988310432.

The spelling of 275511721 in words is "two hundred seventy-five million, five hundred eleven thousand, seven hundred twenty-one".