840166001 has 2 divisors, whose sum is σ = 840166002. Its totient is φ = 840166000.

The previous prime is 840165983. The next prime is 840166007. The reversal of 840166001 is 100661048.

840166001 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 500685376 + 339480625 = 22376^2 + 18425^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-840166001 is a prime.

It is a super-4 number, since 4×840166001⁴ (a number of 37 digits) contains 4444 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (840166007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 420083000 + 420083001.

It is an arithmetic number, because the mean of its divisors is an integer number (420083001).

Almost surely, 2^840166001 is an apocalyptic number.

It is an amenable number.

840166001 is a deficient number, since it is larger than the sum of its proper divisors (1).

840166001 is an equidigital number, since it uses as much as digits as its factorization.

840166001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 840166001 is about 28985.6171402301. The cubic root of 840166001 is about 943.6009460900.

The spelling of 840166001 in words is "eight hundred forty million, one hundred sixty-six thousand, one".