143991131 has 2 divisors, whose sum is σ = 143991132. Its totient is φ = 143991130.

The previous prime is 143991097. The next prime is 143991143. The reversal of 143991131 is 131199341.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 143991131 - 2¹⁰ = 143990107 is a prime.

It is a super-2 number, since 2×143991131² = 41466891613318322, which contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (143991181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71995565 + 71995566.

It is an arithmetic number, because the mean of its divisors is an integer number (71995566).

Almost surely, 2^143991131 is an apocalyptic number.

143991131 is a deficient number, since it is larger than the sum of its proper divisors (1).

143991131 is an equidigital number, since it uses as much as digits as its factorization.

143991131 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2916, while the sum is 32.

The square root of 143991131 is about 11999.6304526431. The cubic root of 143991131 is about 524.1375178082.

The spelling of 143991131 in words is "one hundred forty-three million, nine hundred ninety-one thousand, one hundred thirty-one".