1601869 has 2 divisors, whose sum is σ = 1601870. Its totient is φ = 1601868.

The previous prime is 1601867. The next prime is 1601953. The reversal of 1601869 is 9681061.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 940900 + 660969 = 970^2 + 813^2 .

It is a cyclic number.

It is not a de Polignac number, because 1601869 - 2¹ = 1601867 is a prime.

It is a super-2 number, since 2×1601869² = 5131968586322, which contains 22 as substring.

Together with 1601867, it forms a pair of twin primes.

1601869 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 1601869.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1601861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 800934 + 800935.

It is an arithmetic number, because the mean of its divisors is an integer number (800935).

2^1601869 is an apocalyptic number.

It is an amenable number.

1601869 is a deficient number, since it is larger than the sum of its proper divisors (1).

1601869 is an equidigital number, since it uses as much as digits as its factorization.

1601869 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 31.

The square root of 1601869 is about 1265.6496355627. The cubic root of 1601869 is about 117.0062333835.

The spelling of 1601869 in words is "one million, six hundred one thousand, eight hundred sixty-nine".