143855381 has 2 divisors, whose sum is σ = 143855382. Its totient is φ = 143855380.

The previous prime is 143855359. The next prime is 143855389. The reversal of 143855381 is 183558341.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 110965156 + 32890225 = 10534^2 + 5735^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-143855381 is a prime.

It is a super-2 number, since 2×143855381² = 41388741285310322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (143855389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71927690 + 71927691.

It is an arithmetic number, because the mean of its divisors is an integer number (71927691).

Almost surely, 2^143855381 is an apocalyptic number.

It is an amenable number.

143855381 is a deficient number, since it is larger than the sum of its proper divisors (1).

143855381 is an equidigital number, since it uses as much as digits as its factorization.

143855381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 57600, while the sum is 38.

The square root of 143855381 is about 11993.9726946496. The cubic root of 143855381 is about 523.9727529390.

The spelling of 143855381 in words is "one hundred forty-three million, eight hundred fifty-five thousand, three hundred eighty-one".