1601813 has 2 divisors, whose sum is σ = 1601814. Its totient is φ = 1601812.

The previous prime is 1601797. The next prime is 1601843. The reversal of 1601813 is 3181061.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1532644 + 69169 = 1238^2 + 263^2 .

It is a cyclic number.

It is not a de Polignac number, because 1601813 - 2⁴ = 1601797 is a prime.

It is equal to p₁₂₁₂₆₈ and since 1601813 and 121268 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1601843) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 800906 + 800907.

It is an arithmetic number, because the mean of its divisors is an integer number (800907).

2^1601813 is an apocalyptic number.

It is an amenable number.

1601813 is a deficient number, since it is larger than the sum of its proper divisors (1).

1601813 is an equidigital number, since it uses as much as digits as its factorization.

1601813 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 20.

The square root of 1601813 is about 1265.6275123432. The cubic root of 1601813 is about 117.0048698876.

Adding to 1601813 its reverse (3181061), we get a palindrome (4782874).

The spelling of 1601813 in words is "one million, six hundred one thousand, eight hundred thirteen".