143691161 has 2 divisors, whose sum is σ = 143691162. Its totient is φ = 143691160.

The previous prime is 143691131. The next prime is 143691179. The reversal of 143691161 is 161196341.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 109830400 + 33860761 = 10480^2 + 5819^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-143691161 is a prime.

It is not a weakly prime, because it can be changed into another prime (143691131) 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 as a sum of consecutive naturals, namely, 71845580 + 71845581.

It is an arithmetic number, because the mean of its divisors is an integer number (71845581).

Almost surely, 2^143691161 is an apocalyptic number.

It is an amenable number.

143691161 is a deficient number, since it is larger than the sum of its proper divisors (1).

143691161 is an equidigital number, since it uses as much as digits as its factorization.

143691161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3888, while the sum is 32.

The square root of 143691161 is about 11987.1248012190. The cubic root of 143691161 is about 523.7732943617.

The spelling of 143691161 in words is "one hundred forty-three million, six hundred ninety-one thousand, one hundred sixty-one".