143961391 has 4 divisors (see below), whose sum is σ = 164527312. Its totient is φ = 123395472.

The previous prime is 143961383. The next prime is 143961397. The reversal of 143961391 is 193169341.

143961391 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 143961391 - 2³ = 143961383 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 143961391.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (143961397) 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, 10282950 + ... + 10282963.

It is an arithmetic number, because the mean of its divisors is an integer number (41131828).

Almost surely, 2^143961391 is an apocalyptic number.

143961391 is a deficient number, since it is larger than the sum of its proper divisors (20565921).

143961391 is an equidigital number, since it uses as much as digits as its factorization.

143961391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20565920.

The product of its digits is 17496, while the sum is 37.

The square root of 143961391 is about 11998.3911838213. The cubic root of 143961391 is about 524.1014301154.

The spelling of 143961391 in words is "one hundred forty-three million, nine hundred sixty-one thousand, three hundred ninety-one".