143917993 has 2 divisors, whose sum is σ = 143917994. Its totient is φ = 143917992.

The previous prime is 143917979. The next prime is 143917999. The reversal of 143917993 is 399719341.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 81144064 + 62773929 = 9008^2 + 7923^2 .

It is a cyclic number.

It is not a de Polignac number, because 143917993 - 2²¹ = 141820841 is a prime.

It is not a weakly prime, because it can be changed into another prime (143917999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71958996 + 71958997.

It is an arithmetic number, because the mean of its divisors is an integer number (71958997).

Almost surely, 2^143917993 is an apocalyptic number.

It is an amenable number.

143917993 is a deficient number, since it is larger than the sum of its proper divisors (1).

143917993 is an equidigital number, since it uses as much as digits as its factorization.

143917993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 183708, while the sum is 46.

The square root of 143917993 is about 11996.5825550446. The cubic root of 143917993 is about 524.0487603461.

The spelling of 143917993 in words is "one hundred forty-three million, nine hundred seventeen thousand, nine hundred ninety-three".