1969661 has 2 divisors, whose sum is σ = 1969662. Its totient is φ = 1969660.

The previous prime is 1969657. The next prime is 1969691. The reversal of 1969661 is 1669691.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1907161 + 62500 = 1381^2 + 250^2 .

It is a cyclic number.

It is not a de Polignac number, because 1969661 - 2² = 1969657 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 (1969691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 984830 + 984831.

It is an arithmetic number, because the mean of its divisors is an integer number (984831).

2^1969661 is an apocalyptic number.

It is an amenable number.

1969661 is a deficient number, since it is larger than the sum of its proper divisors (1).

1969661 is an equidigital number, since it uses as much as digits as its factorization.

1969661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17496, while the sum is 38.

The square root of 1969661 is about 1403.4461158164. The cubic root of 1969661 is about 125.3517770943.

The spelling of 1969661 in words is "one million, nine hundred sixty-nine thousand, six hundred sixty-one".