143401381 has 18 divisors (see below), whose sum is σ = 153686610. Its totient is φ = 133786080.

The previous prime is 143401367. The next prime is 143401387. The reversal of 143401381 is 183104341.

It can be written as a sum of positive squares in 3 ways, for example, as 94750756 + 48650625 = 9734^2 + 6975^2 .

It is not a de Polignac number, because 143401381 - 2⁷ = 143401253 is a prime.

It is a super-2 number, since 2×143401381² = 41127912145414322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (143401387) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 1315555 + ... + 1315663.

It is an arithmetic number, because the mean of its divisors is an integer number (8538145).

Almost surely, 2^143401381 is an apocalyptic number.

It is an amenable number.

143401381 is a deficient number, since it is larger than the sum of its proper divisors (10285229).

143401381 is an equidigital number, since it uses as much as digits as its factorization.

143401381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 245 (or 177 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 143401381 is about 11975.0315657204. The cubic root of 143401381 is about 523.4209619267.

The spelling of 143401381 in words is "one hundred forty-three million, four hundred one thousand, three hundred eighty-one".