143835661 has 2 divisors, whose sum is σ = 143835662. Its totient is φ = 143835660.

The previous prime is 143835649. The next prime is 143835673. The reversal of 143835661 is 166538341.

It is a balanced prime because it is at equal distance from previous prime (143835649) and next prime (143835673).

It can be written as a sum of positive squares in only one way, i.e., 127554436 + 16281225 = 11294^2 + 4035^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-143835661 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 143835661.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (143835611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71917830 + 71917831.

It is an arithmetic number, because the mean of its divisors is an integer number (71917831).

Almost surely, 2^143835661 is an apocalyptic number.

143835661 is the 5364-th centered decagonal number.

It is an amenable number.

143835661 is a deficient number, since it is larger than the sum of its proper divisors (1).

143835661 is an equidigital number, since it uses as much as digits as its factorization.

143835661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 51840, while the sum is 37.

The square root of 143835661 is about 11993.1505868975. The cubic root of 143835661 is about 523.9488094137.

The spelling of 143835661 in words is "one hundred forty-three million, eight hundred thirty-five thousand, six hundred sixty-one".