6998681 has 2 divisors, whose sum is σ = 6998682.
Its totient is φ = 6998680.
The previous prime is 6998627. The next prime is 6998687. The reversal of 6998681 is 1868996.
It is a strong prime.
It can be written as a sum of positive squares in only one way, i.e., 4910656 + 2088025 = 2216^2 + 1445^2
It is a cyclic number.
It is not a de Polignac number, because 6998681 - 26 = 6998617 is a prime.
It is a super-2 number, since 2×69986812 = 97963071479522, which contains 22 as substring.
It is a Chen prime.
It is not a weakly prime, because it can be changed into another prime (6998687) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3499340 + 3499341.
It is an arithmetic number, because the mean of its divisors is an integer number (3499341).
Almost surely, 26998681 is an apocalyptic number.
It is an amenable number.
6998681 is a deficient number, since it is larger than the sum of its proper divisors (1).
6998681 is an equidigital number, since it uses as much as digits as its factorization.
6998681 is an evil number, because the sum of its binary digits is even.
The product of its digits is 186624, while the sum is 47.
The square root of 6998681 is about 2645.5020317513.
The cubic root of 6998681 is about 191.2811024928.
The spelling of 6998681 in words is "six million, nine hundred ninety-eight thousand, six hundred eighty-one".