143397931 has 2 divisors, whose sum is σ = 143397932. Its totient is φ = 143397930.

The previous prime is 143397929. The next prime is 143397937. The reversal of 143397931 is 139793341.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 143397931 - 2¹ = 143397929 is a prime.

It is a super-2 number, since 2×143397931² = 41125933230161522, which contains 22 as substring.

Together with 143397929, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (143397937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71698965 + 71698966.

It is an arithmetic number, because the mean of its divisors is an integer number (71698966).

Almost surely, 2^143397931 is an apocalyptic number.

143397931 is a deficient number, since it is larger than the sum of its proper divisors (1).

143397931 is an equidigital number, since it uses as much as digits as its factorization.

143397931 is an evil number, because the sum of its binary digits is even.

The product of its digits is 61236, while the sum is 40.

The square root of 143397931 is about 11974.8875151293. The cubic root of 143397931 is about 523.4167643456.

The spelling of 143397931 in words is "one hundred forty-three million, three hundred ninety-seven thousand, nine hundred thirty-one".