143681947 has 4 divisors (see below), whose sum is σ = 145000240. Its totient is φ = 142363656.

The previous prime is 143681939. The next prime is 143681953. The reversal of 143681947 is 749186341.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 749186341 = 1933 ⋅387577.

It is a cyclic number.

It is not a de Polignac number, because 143681947 - 2³ = 143681939 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (143681987) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 658983 + ... + 659200.

It is an arithmetic number, because the mean of its divisors is an integer number (36250060).

Almost surely, 2^143681947 is an apocalyptic number.

143681947 is a deficient number, since it is larger than the sum of its proper divisors (1318293).

143681947 is a wasteful number, since it uses less digits than its factorization.

143681947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1318292.

The product of its digits is 145152, while the sum is 43.

The square root of 143681947 is about 11986.7404660316. The cubic root of 143681947 is about 523.7620987061.

The spelling of 143681947 in words is "one hundred forty-three million, six hundred eighty-one thousand, nine hundred forty-seven".