1801669 has 2 divisors, whose sum is σ = 1801670. Its totient is φ = 1801668.

The previous prime is 1801619. The next prime is 1801673. The reversal of 1801669 is 9661081.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1221025 + 580644 = 1105^2 + 762^2 .

It is a cyclic number.

It is not a de Polignac number, because 1801669 - 2¹¹ = 1799621 is a prime.

It is a super-2 number, since 2×1801669² = 6492022371122, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1801669.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1801619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 900834 + 900835.

It is an arithmetic number, because the mean of its divisors is an integer number (900835).

2^1801669 is an apocalyptic number.

It is an amenable number.

1801669 is a deficient number, since it is larger than the sum of its proper divisors (1).

1801669 is an equidigital number, since it uses as much as digits as its factorization.

1801669 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 1801669 is about 1342.2626419595. The cubic root of 1801669 is about 121.6816253162.

It can be divided in two parts, 180 and 1669, that added together give a square (1849 = 43²).

The spelling of 1801669 in words is "one million, eight hundred one thousand, six hundred sixty-nine".