840100669 has 2 divisors, whose sum is σ = 840100670. Its totient is φ = 840100668.

The previous prime is 840100661. The next prime is 840100673. The reversal of 840100669 is 966001048.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 804459769 + 35640900 = 28363^2 + 5970^2 .

It is a cyclic number.

It is not a de Polignac number, because 840100669 - 2³ = 840100661 is a prime.

It is a super-2 number, since 2×840100669² = 1411538268108495122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (840100661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 420050334 + 420050335.

It is an arithmetic number, because the mean of its divisors is an integer number (420050335).

Almost surely, 2^840100669 is an apocalyptic number.

It is an amenable number.

840100669 is a deficient number, since it is larger than the sum of its proper divisors (1).

840100669 is an equidigital number, since it uses as much as digits as its factorization.

840100669 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 840100669 is about 28984.4901455934. The cubic root of 840100669 is about 943.5764870605.

The spelling of 840100669 in words is "eight hundred forty million, one hundred thousand, six hundred sixty-nine".