1143661 has 2 divisors, whose sum is σ = 1143662. Its totient is φ = 1143660.

The previous prime is 1143647. The next prime is 1143679. The reversal of 1143661 is 1663411.

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., 1142761 + 900 = 1069^2 + 30^2 .

It is a cyclic number.

It is not a de Polignac number, because 1143661 - 2¹³ = 1135469 is a prime.

It is a Chen prime.

1143661 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1143601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 571830 + 571831.

It is an arithmetic number, because the mean of its divisors is an integer number (571831).

2^1143661 is an apocalyptic number.

It is an amenable number.

1143661 is a deficient number, since it is larger than the sum of its proper divisors (1).

1143661 is an equidigital number, since it uses as much as digits as its factorization.

1143661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 432, while the sum is 22.

The square root of 1143661 is about 1069.4208713131. The cubic root of 1143661 is about 104.5760989619.

The spelling of 1143661 in words is "one million, one hundred forty-three thousand, six hundred sixty-one".