143421181 has 2 divisors, whose sum is σ = 143421182. Its totient is φ = 143421180.

The previous prime is 143421143. The next prime is 143421199. The reversal of 143421181 is 181124341.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 118069956 + 25351225 = 10866^2 + 5035^2 .

It is a cyclic number.

It is not a de Polignac number, because 143421181 - 2¹³ = 143412989 is a prime.

It is a super-2 number, since 2×143421181² = 41139270318869522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (143421881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71710590 + 71710591.

It is an arithmetic number, because the mean of its divisors is an integer number (71710591).

Almost surely, 2^143421181 is an apocalyptic number.

It is an amenable number.

143421181 is a deficient number, since it is larger than the sum of its proper divisors (1).

143421181 is an equidigital number, since it uses as much as digits as its factorization.

143421181 is an evil number, because the sum of its binary digits is even.

The product of its digits is 768, while the sum is 25.

The square root of 143421181 is about 11975.8582573442. The cubic root of 143421181 is about 523.4450510906.

The spelling of 143421181 in words is "one hundred forty-three million, four hundred twenty-one thousand, one hundred eighty-one".