143920993991 has 12 divisors (see below), whose sum is σ = 152957395920. Its totient is φ = 135390850560.

The previous prime is 143920993981. The next prime is 143920994011. The reversal of 143920993991 is 199399029341.

It is not a de Polignac number, because 143920993991 - 2²² = 143916799687 is a prime.

It is a super-2 number, since 2×143920993991² (a number of 23 digits) contains 22 as substring.

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 143920993991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (143920993901) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 498326 + ... + 732236.

It is an arithmetic number, because the mean of its divisors is an integer number (12746449660).

Almost surely, 2^143920993991 is an apocalyptic number.

143920993991 is a deficient number, since it is larger than the sum of its proper divisors (9036401929).

143920993991 is a wasteful number, since it uses less digits than its factorization.

143920993991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 236074 (or 236057 counting only the distinct ones).

The product of its (nonzero) digits is 4251528, while the sum is 59.

The spelling of 143920993991 in words is "one hundred forty-three billion, nine hundred twenty million, nine hundred ninety-three thousand, nine hundred ninety-one".