143971913 has 2 divisors, whose sum is σ = 143971914. Its totient is φ = 143971912.

The previous prime is 143971879. The next prime is 143971931. The reversal of 143971913 is 319179341.

Together with next prime (143971931) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 100240144 + 43731769 = 10012^2 + 6613^2 .

It is a cyclic number.

It is not a de Polignac number, because 143971913 - 2²⁰ = 142923337 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (143971943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71985956 + 71985957.

It is an arithmetic number, because the mean of its divisors is an integer number (71985957).

Almost surely, 2^143971913 is an apocalyptic number.

It is an amenable number.

143971913 is a deficient number, since it is larger than the sum of its proper divisors (1).

143971913 is an equidigital number, since it uses as much as digits as its factorization.

143971913 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20412, while the sum is 38.

The square root of 143971913 is about 11998.8296512618. The cubic root of 143971913 is about 524.1141984946.

The spelling of 143971913 in words is "one hundred forty-three million, nine hundred seventy-one thousand, nine hundred thirteen".