276471721 has 2 divisors, whose sum is σ = 276471722. Its totient is φ = 276471720.

The previous prime is 276471683. The next prime is 276471737. The reversal of 276471721 is 127174672.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 156875625 + 119596096 = 12525^2 + 10936^2 .

It is a cyclic number.

It is not a de Polignac number, because 276471721 - 2⁷ = 276471593 is a prime.

It is a super-2 number, since 2×276471721² = 152873225025403682, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (276471751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 138235860 + 138235861.

It is an arithmetic number, because the mean of its divisors is an integer number (138235861).

Almost surely, 2^276471721 is an apocalyptic number.

It is an amenable number.

276471721 is a deficient number, since it is larger than the sum of its proper divisors (1).

276471721 is an equidigital number, since it uses as much as digits as its factorization.

276471721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32928, while the sum is 37.

The square root of 276471721 is about 16627.4387985643. The cubic root of 276471721 is about 651.4537254111.

The spelling of 276471721 in words is "two hundred seventy-six million, four hundred seventy-one thousand, seven hundred twenty-one".