1198621 has 2 divisors, whose sum is σ = 1198622. Its totient is φ = 1198620.

The previous prime is 1198609. The next prime is 1198643. The reversal of 1198621 is 1268911.

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., 1125721 + 72900 = 1061^2 + 270^2 .

It is a cyclic number.

It is not a de Polignac number, because 1198621 - 2¹³ = 1190429 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1198621.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1198651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 599310 + 599311.

It is an arithmetic number, because the mean of its divisors is an integer number (599311).

2^1198621 is an apocalyptic number.

It is an amenable number.

1198621 is a deficient number, since it is larger than the sum of its proper divisors (1).

1198621 is an equidigital number, since it uses as much as digits as its factorization.

1198621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 864, while the sum is 28.

The square root of 1198621 is about 1094.8155095723. The cubic root of 1198621 is about 106.2251355889.

The spelling of 1198621 in words is "one million, one hundred ninety-eight thousand, six hundred twenty-one".