1271621 has 8 divisors (see below), whose sum is σ = 1417080. Its totient is φ = 1132992.

The previous prime is 1271609. The next prime is 1271657. The reversal of 1271621 is 1261721.

It can be written as a sum of positive squares in 4 ways, for example, as 348100 + 923521 = 590^2 + 961^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1271621 - 2¹⁴ = 1255237 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1271593 and 1271602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1271671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1310 + ... + 2063.

It is an arithmetic number, because the mean of its divisors is an integer number (177135).

2^1271621 is an apocalyptic number.

It is an amenable number.

1271621 is a deficient number, since it is larger than the sum of its proper divisors (145459).

1271621 is a wasteful number, since it uses less digits than its factorization.

1271621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3415.

The product of its digits is 168, while the sum is 20.

The square root of 1271621 is about 1127.6617400622. The cubic root of 1271621 is about 108.3392680509.

The spelling of 1271621 in words is "one million, two hundred seventy-one thousand, six hundred twenty-one".