1018621 has 2 divisors, whose sum is σ = 1018622. Its totient is φ = 1018620.

The previous prime is 1018613. The next prime is 1018643. The reversal of 1018621 is 1268101.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 881721 + 136900 = 939^2 + 370^2 .

It is a cyclic number.

It is not a de Polignac number, because 1018621 - 2³ = 1018613 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1018651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 509310 + 509311.

It is an arithmetic number, because the mean of its divisors is an integer number (509311).

2^1018621 is an apocalyptic number.

It is an amenable number.

1018621 is a deficient number, since it is larger than the sum of its proper divisors (1).

1018621 is an equidigital number, since it uses as much as digits as its factorization.

1018621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 19.

The square root of 1018621 is about 1009.2675562010. The cubic root of 1018621 is about 100.6168866830.

The spelling of 1018621 in words is "one million, eighteen thousand, six hundred twenty-one".