1601861 has 2 divisors, whose sum is σ = 1601862. Its totient is φ = 1601860.

The previous prime is 1601857. The next prime is 1601867. The reversal of 1601861 is 1681061.

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., 1416100 + 185761 = 1190^2 + 431^2 .

It is an emirp because it is prime and its reverse (1681061) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1601861 - 2² = 1601857 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1601867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 800930 + 800931.

It is an arithmetic number, because the mean of its divisors is an integer number (800931).

2^1601861 is an apocalyptic number.

It is an amenable number.

1601861 is a deficient number, since it is larger than the sum of its proper divisors (1).

1601861 is an equidigital number, since it uses as much as digits as its factorization.

1601861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 23.

The square root of 1601861 is about 1265.6464751264. The cubic root of 1601861 is about 117.0060386004.

The spelling of 1601861 in words is "one million, six hundred one thousand, eight hundred sixty-one".