118621 has 2 divisors, whose sum is σ = 118622. Its totient is φ = 118620.

The previous prime is 118619. The next prime is 118633. The reversal of 118621 is 126811.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 105625 + 12996 = 325^2 + 114^2 .

It is a cyclic number.

It is not a de Polignac number, because 118621 - 2¹ = 118619 is a prime.

Together with 118619, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (118661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 59310 + 59311.

It is an arithmetic number, because the mean of its divisors is an integer number (59311).

2¹¹⁸⁶²¹ is an apocalyptic number.

It is an amenable number.

118621 is a deficient number, since it is larger than the sum of its proper divisors (1).

118621 is an equidigital number, since it uses as much as digits as its factorization.

118621 is an evil number, because the sum of its binary digits is even.

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

The square root of 118621 is about 344.4139950699. The cubic root of 118621 is about 49.1345738408.

The spelling of 118621 in words is "one hundred eighteen thousand, six hundred twenty-one".