143815421 has 2 divisors, whose sum is σ = 143815422. Its totient is φ = 143815420.

The previous prime is 143815409. The next prime is 143815423. The reversal of 143815421 is 124518341.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 131354521 + 12460900 = 11461^2 + 3530^2 .

It is a cyclic number.

It is not a de Polignac number, because 143815421 - 2¹⁴ = 143799037 is a prime.

Together with 143815423, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (143815423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71907710 + 71907711.

It is an arithmetic number, because the mean of its divisors is an integer number (71907711).

Almost surely, 2^143815421 is an apocalyptic number.

It is an amenable number.

143815421 is a deficient number, since it is larger than the sum of its proper divisors (1).

143815421 is an equidigital number, since it uses as much as digits as its factorization.

143815421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3840, while the sum is 29.

The square root of 143815421 is about 11992.3067422410. The cubic root of 143815421 is about 523.9242322417.

The spelling of 143815421 in words is "one hundred forty-three million, eight hundred fifteen thousand, four hundred twenty-one".