1276621 has 2 divisors, whose sum is σ = 1276622. Its totient is φ = 1276620.

The previous prime is 1276619. The next prime is 1276631. The reversal of 1276621 is 1266721.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1232100 + 44521 = 1110^2 + 211^2 .

It is a cyclic number.

It is not a de Polignac number, because 1276621 - 2¹ = 1276619 is a prime.

It is a super-2 number, since 2×1276621² = 3259522355282, which contains 22 as substring.

Together with 1276619, it forms a pair of twin primes.

It is a plaindrome in base 16.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1276631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 638310 + 638311.

It is an arithmetic number, because the mean of its divisors is an integer number (638311).

2^1276621 is an apocalyptic number.

It is an amenable number.

1276621 is a deficient number, since it is larger than the sum of its proper divisors (1).

1276621 is an equidigital number, since it uses as much as digits as its factorization.

1276621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1008, while the sum is 25.

The square root of 1276621 is about 1129.8765419284. The cubic root of 1276621 is about 108.4810786234.

The spelling of 1276621 in words is "one million, two hundred seventy-six thousand, six hundred twenty-one".