143155421 has 4 divisors (see below), whose sum is σ = 143516412. Its totient is φ = 142794432.

The previous prime is 143155403. The next prime is 143155423. The reversal of 143155421 is 124551341.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 57592921 + 85562500 = 7589^2 + 9250^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-143155421 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (143155423) 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 in 3 ways as a sum of consecutive naturals, for example, 179900 + ... + 180693.

It is an arithmetic number, because the mean of its divisors is an integer number (35879103).

Almost surely, 2^143155421 is an apocalyptic number.

It is an amenable number.

143155421 is a deficient number, since it is larger than the sum of its proper divisors (360991).

143155421 is an equidigital number, since it uses as much as digits as its factorization.

143155421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 360990.

The product of its digits is 2400, while the sum is 26.

The square root of 143155421 is about 11964.7574567979. The cubic root of 143155421 is about 523.1215359523.

The spelling of 143155421 in words is "one hundred forty-three million, one hundred fifty-five thousand, four hundred twenty-one".