143691893 has 2 divisors, whose sum is σ = 143691894. Its totient is φ = 143691892.

The previous prime is 143691887. The next prime is 143691907. The reversal of 143691893 is 398196341.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 136843204 + 6848689 = 11698^2 + 2617^2 .

It is a cyclic number.

It is not a de Polignac number, because 143691893 - 2⁶ = 143691829 is a prime.

It is a super-2 number, since 2×143691893² = 41294720227846898, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (143691883) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71845946 + 71845947.

It is an arithmetic number, because the mean of its divisors is an integer number (71845947).

Almost surely, 2^143691893 is an apocalyptic number.

It is an amenable number.

143691893 is a deficient number, since it is larger than the sum of its proper divisors (1).

143691893 is an equidigital number, since it uses as much as digits as its factorization.

143691893 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 143691893 is about 11987.1553339397. The cubic root of 143691893 is about 523.7741837725.

The spelling of 143691893 in words is "one hundred forty-three million, six hundred ninety-one thousand, eight hundred ninety-three".