918641 has 2 divisors, whose sum is σ = 918642. Its totient is φ = 918640.

The previous prime is 918613. The next prime is 918647. The reversal of 918641 is 146819.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 758641 + 160000 = 871^2 + 400^2 .

It is an emirp because it is prime and its reverse (146819) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 918641 - 2¹⁰ = 917617 is a prime.

It is not a weakly prime, because it can be changed into another prime (918647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 459320 + 459321.

It is an arithmetic number, because the mean of its divisors is an integer number (459321).

2⁹¹⁸⁶⁴¹ is an apocalyptic number.

It is an amenable number.

918641 is a deficient number, since it is larger than the sum of its proper divisors (1).

918641 is an equidigital number, since it uses as much as digits as its factorization.

918641 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1728, while the sum is 29.

The square root of 918641 is about 958.4576151296. The cubic root of 918641 is about 97.2109695941.

The spelling of 918641 in words is "nine hundred eighteen thousand, six hundred forty-one".