1276721 has 2 divisors, whose sum is σ = 1276722. Its totient is φ = 1276720.

The previous prime is 1276711. The next prime is 1276733.

1276721 is nontrivially palindromic in base 10.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1221025 + 55696 = 1105^2 + 236^2 .

It is a palprime.

It is a cyclic number.

It is not a de Polignac number, because 1276721 - 2⁶ = 1276657 is a prime.

It is a Chen prime.

It is an alternating number because its digits alternate between odd and even.

It is not a weakly prime, because it can be changed into another prime (1276711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 638360 + 638361.

It is an arithmetic number, because the mean of its divisors is an integer number (638361).

2^1276721 is an apocalyptic number.

It is an amenable number.

1276721 is a deficient number, since it is larger than the sum of its proper divisors (1).

1276721 is an equidigital number, since it uses as much as digits as its factorization.

1276721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1176, while the sum is 26.

The square root of 1276721 is about 1129.9207936842. The cubic root of 1276721 is about 108.4839110549.

The spelling of 1276721 in words is "one million, two hundred seventy-six thousand, seven hundred twenty-one".