143287381 has 2 divisors, whose sum is σ = 143287382. Its totient is φ = 143287380.

The previous prime is 143287343. The next prime is 143287399. The reversal of 143287381 is 183782341.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 102212100 + 41075281 = 10110^2 + 6409^2 .

It is an emirp because it is prime and its reverse (183782341) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 143287381 - 2²¹ = 141190229 is a prime.

It is a super-2 number, since 2×143287381² = 41062547107678322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 143287381.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (143287321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71643690 + 71643691.

It is an arithmetic number, because the mean of its divisors is an integer number (71643691).

Almost surely, 2^143287381 is an apocalyptic number.

It is an amenable number.

143287381 is a deficient number, since it is larger than the sum of its proper divisors (1).

143287381 is an equidigital number, since it uses as much as digits as its factorization.

143287381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 32256, while the sum is 37.

The square root of 143287381 is about 11970.2707154016. The cubic root of 143287381 is about 523.2822235868.

The spelling of 143287381 in words is "one hundred forty-three million, two hundred eighty-seven thousand, three hundred eighty-one".