1243431071 has 2 divisors, whose sum is σ = 1243431072. Its totient is φ = 1243431070.

The previous prime is 1243431061. The next prime is 1243431073. The reversal of 1243431071 is 1701343421.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1243431071 - 2²⁶ = 1176322207 is a prime.

It is a super-2 number, since 2×1243431071² = 3092241656656414082, which contains 22 as substring.

Together with 1243431073, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1243431071.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1243431073) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621715535 + 621715536.

It is an arithmetic number, because the mean of its divisors is an integer number (621715536).

Almost surely, 2^1243431071 is an apocalyptic number.

1243431071 is a deficient number, since it is larger than the sum of its proper divisors (1).

1243431071 is an equidigital number, since it uses as much as digits as its factorization.

1243431071 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 1243431071 is about 35262.3180037842. The cubic root of 1243431071 is about 1075.3270527515.

Adding to 1243431071 its reverse (1701343421), we get a palindrome (2944774492).

The spelling of 1243431071 in words is "one billion, two hundred forty-three million, four hundred thirty-one thousand, seventy-one".