1016621 has 2 divisors, whose sum is σ = 1016622. Its totient is φ = 1016620.

The previous prime is 1016611. The next prime is 1016641. The reversal of 1016621 is 1266101.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 662596 + 354025 = 814^2 + 595^2 .

It is an emirp because it is prime and its reverse (1266101) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1016621 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1016621.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1016611) 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 as a sum of consecutive naturals, namely, 508310 + 508311.

It is an arithmetic number, because the mean of its divisors is an integer number (508311).

2^1016621 is an apocalyptic number.

It is an amenable number.

1016621 is a deficient number, since it is larger than the sum of its proper divisors (1).

1016621 is an equidigital number, since it uses as much as digits as its factorization.

1016621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 1016621 is about 1008.2762518278. The cubic root of 1016621 is about 100.5509918374.

The spelling of 1016621 in words is "one million, sixteen thousand, six hundred twenty-one".