1123621 has 2 divisors, whose sum is σ = 1123622. Its totient is φ = 1123620.

The previous prime is 1123601. The next prime is 1123631. The reversal of 1123621 is 1263211.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1079521 + 44100 = 1039^2 + 210^2 .

It is a cyclic number.

It is not a de Polignac number, because 1123621 - 2⁵ = 1123589 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1123595 and 1123604.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1123601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 561810 + 561811.

It is an arithmetic number, because the mean of its divisors is an integer number (561811).

2^1123621 is an apocalyptic number.

It is an amenable number.

1123621 is a deficient number, since it is larger than the sum of its proper divisors (1).

1123621 is an equidigital number, since it uses as much as digits as its factorization.

1123621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 72, while the sum is 16.

The square root of 1123621 is about 1060.0099056141. The cubic root of 1123621 is about 103.9616784354.

Adding to 1123621 its reverse (1263211), we get a palindrome (2386832).

It can be divided in two parts, 11 and 23621, that added together give a palindrome (23632).

The spelling of 1123621 in words is "one million, one hundred twenty-three thousand, six hundred twenty-one".