1273721 has 2 divisors, whose sum is σ = 1273722. Its totient is φ = 1273720.

The previous prime is 1273693. The next prime is 1273729.

1273721 is nontrivially palindromic in base 10.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1254400 + 19321 = 1120^2 + 139^2 .

It is a palprime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1273721 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1273729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 636860 + 636861.

It is an arithmetic number, because the mean of its divisors is an integer number (636861).

2^1273721 is an apocalyptic number.

It is an amenable number.

1273721 is a deficient number, since it is larger than the sum of its proper divisors (1).

1273721 is an equidigital number, since it uses as much as digits as its factorization.

1273721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 588, while the sum is 23.

The square root of 1273721 is about 1128.5924862412. The cubic root of 1273721 is about 108.3988736874.

The spelling of 1273721 in words is "one million, two hundred seventy-three thousand, seven hundred twenty-one".