143531631 has 6 divisors (see below), whose sum is σ = 207323480. Its totient is φ = 95687748.

The previous prime is 143531623. The next prime is 143531653. The reversal of 143531631 is 136135341.

It is not a de Polignac number, because 143531631 - 2³ = 143531623 is a prime.

It is a super-2 number, since 2×143531631² = 41202658195040322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 143531595 and 143531604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (143531831) 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, 7973971 + ... + 7973988.

Almost surely, 2^143531631 is an apocalyptic number.

143531631 is a deficient number, since it is larger than the sum of its proper divisors (63791849).

143531631 is a wasteful number, since it uses less digits than its factorization.

143531631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15947965 (or 15947962 counting only the distinct ones).

The product of its digits is 3240, while the sum is 27.

The square root of 143531631 is about 11980.4687303962. The cubic root of 143531631 is about 523.5793865973.

Adding to 143531631 its reverse (136135341), we get a palindrome (279666972).

The spelling of 143531631 in words is "one hundred forty-three million, five hundred thirty-one thousand, six hundred thirty-one".