143661247 has 2 divisors, whose sum is σ = 143661248. Its totient is φ = 143661246.

The previous prime is 143661241. The next prime is 143661317. The reversal of 143661247 is 742166341.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 143661247 - 2³ = 143661239 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (143661241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71830623 + 71830624.

It is an arithmetic number, because the mean of its divisors is an integer number (71830624).

Almost surely, 2^143661247 is an apocalyptic number.

143661247 is a deficient number, since it is larger than the sum of its proper divisors (1).

143661247 is an equidigital number, since it uses as much as digits as its factorization.

143661247 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24192, while the sum is 34.

The square root of 143661247 is about 11985.8769808471. The cubic root of 143661247 is about 523.7369450098.

The spelling of 143661247 in words is "one hundred forty-three million, six hundred sixty-one thousand, two hundred forty-seven".