1659401 has 2 divisors, whose sum is σ = 1659402. Its totient is φ = 1659400.

The previous prime is 1659373. The next prime is 1659407. The reversal of 1659401 is 1049561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1537600 + 121801 = 1240^2 + 349^2 .

It is a cyclic number.

It is not a de Polignac number, because 1659401 - 2¹⁸ = 1397257 is a prime.

It is a super-2 number, since 2×1659401² = 5507223357602, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1659407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 829700 + 829701.

It is an arithmetic number, because the mean of its divisors is an integer number (829701).

2^1659401 is an apocalyptic number.

It is an amenable number.

1659401 is a deficient number, since it is larger than the sum of its proper divisors (1).

1659401 is an equidigital number, since it uses as much as digits as its factorization.

1659401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1080, while the sum is 26.

The square root of 1659401 is about 1288.1773946161. The cubic root of 1659401 is about 118.3905711767.

The spelling of 1659401 in words is "one million, six hundred fifty-nine thousand, four hundred one".