143991863 has 2 divisors, whose sum is σ = 143991864. Its totient is φ = 143991862.

The previous prime is 143991857. The next prime is 143991889. The reversal of 143991863 is 368199341.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 143991863 - 2⁸ = 143991607 is a prime.

It is a super-2 number, since 2×143991863² = 41467313220421538, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (143991163) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71995931 + 71995932.

It is an arithmetic number, because the mean of its divisors is an integer number (71995932).

Almost surely, 2^143991863 is an apocalyptic number.

143991863 is a deficient number, since it is larger than the sum of its proper divisors (1).

143991863 is an equidigital number, since it uses as much as digits as its factorization.

143991863 is an evil number, because the sum of its binary digits is even.

The product of its digits is 139968, while the sum is 44.

The square root of 143991863 is about 11999.6609535436. The cubic root of 143991863 is about 524.1384059833.

The spelling of 143991863 in words is "one hundred forty-three million, nine hundred ninety-one thousand, eight hundred sixty-three".