143521641 has 6 divisors (see below), whose sum is σ = 207309050. Its totient is φ = 95681088.

The previous prime is 143521627. The next prime is 143521657. The reversal of 143521641 is 146125341.

It is a happy number.

143521641 is a `hidden beast` number, since 14 + 3 + 5 + 2 + 1 + 641 = 666.

It can be written as a sum of positive squares in only one way, i.e., 96118416 + 47403225 = 9804^2 + 6885^2 .

It is not a de Polignac number, because 143521641 - 2⁷ = 143521513 is a prime.

It is a super-2 number, since 2×143521641² = 41196922870665762, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (143521621) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7973416 + ... + 7973433.

Almost surely, 2^143521641 is an apocalyptic number.

It is an amenable number.

143521641 is a deficient number, since it is larger than the sum of its proper divisors (63787409).

143521641 is a wasteful number, since it uses less digits than its factorization.

143521641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15946855 (or 15946852 counting only the distinct ones).

The product of its digits is 2880, while the sum is 27.

The square root of 143521641 is about 11980.0517945458. The cubic root of 143521641 is about 523.5672390324.

Adding to 143521641 its reverse (146125341), we get a palindrome (289646982).

The spelling of 143521641 in words is "one hundred forty-three million, five hundred twenty-one thousand, six hundred forty-one".