143256649 has 2 divisors, whose sum is σ = 143256650. Its totient is φ = 143256648.

The previous prime is 143256647. The next prime is 143256667. The reversal of 143256649 is 946652341.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 112254025 + 31002624 = 10595^2 + 5568^2 .

It is an emirp because it is prime and its reverse (946652341) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 143256649 - 2¹ = 143256647 is a prime.

Together with 143256647, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (143256643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71628324 + 71628325.

It is an arithmetic number, because the mean of its divisors is an integer number (71628325).

Almost surely, 2^143256649 is an apocalyptic number.

It is an amenable number.

143256649 is a deficient number, since it is larger than the sum of its proper divisors (1).

143256649 is an equidigital number, since it uses as much as digits as its factorization.

143256649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 155520, while the sum is 40.

The square root of 143256649 is about 11968.9869663226. The cubic root of 143256649 is about 523.2448100592.

It can be divided in two parts, 1432 and 56649, that added together give a square (58081 = 241²).

The spelling of 143256649 in words is "one hundred forty-three million, two hundred fifty-six thousand, six hundred forty-nine".