1661741 has 2 divisors, whose sum is σ = 1661742. Its totient is φ = 1661740.

The previous prime is 1661731. The next prime is 1661789. The reversal of 1661741 is 1471661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1612900 + 48841 = 1270^2 + 221^2 .

It is an emirp because it is prime and its reverse (1471661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1661741 - 2⁶ = 1661677 is a prime.

It is a super-2 number, since 2×1661741² = 5522766302162, 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 1661741.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1661731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 830870 + 830871.

It is an arithmetic number, because the mean of its divisors is an integer number (830871).

2^1661741 is an apocalyptic number.

It is an amenable number.

1661741 is a deficient number, since it is larger than the sum of its proper divisors (1).

1661741 is an equidigital number, since it uses as much as digits as its factorization.

1661741 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1008, while the sum is 26.

The square root of 1661741 is about 1289.0853346462. The cubic root of 1661741 is about 118.4461944244.

The spelling of 1661741 in words is "one million, six hundred sixty-one thousand, seven hundred forty-one".