143971813 has 2 divisors, whose sum is σ = 143971814. Its totient is φ = 143971812.

The previous prime is 143971801. The next prime is 143971819. The reversal of 143971813 is 318179341.

143971813 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is the 4899-th star number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 126180289 + 17791524 = 11233^2 + 4218^2 .

It is a cyclic number.

It is not a de Polignac number, because 143971813 - 2²¹ = 141874661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (143971819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71985906 + 71985907.

It is an arithmetic number, because the mean of its divisors is an integer number (71985907).

Almost surely, 2^143971813 is an apocalyptic number.

It is an amenable number.

143971813 is a deficient number, since it is larger than the sum of its proper divisors (1).

143971813 is an equidigital number, since it uses as much as digits as its factorization.

143971813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18144, while the sum is 37.

The square root of 143971813 is about 11998.8254841880. The cubic root of 143971813 is about 524.1140771482.

The spelling of 143971813 in words is "one hundred forty-three million, nine hundred seventy-one thousand, eight hundred thirteen".