1023431239 has 2 divisors, whose sum is σ = 1023431240. Its totient is φ = 1023431238.

The previous prime is 1023431191. The next prime is 1023431249. The reversal of 1023431239 is 9321343201.

It is a strong prime.

It is an emirp because it is prime and its reverse (9321343201) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1023431239 - 2¹¹ = 1023429191 is a prime.

It is a super-2 number, since 2×1023431239² = 2094823001922150242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1023431249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 511715619 + 511715620.

It is an arithmetic number, because the mean of its divisors is an integer number (511715620).

Almost surely, 2^1023431239 is an apocalyptic number.

1023431239 is a deficient number, since it is larger than the sum of its proper divisors (1).

1023431239 is an equidigital number, since it uses as much as digits as its factorization.

1023431239 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3888, while the sum is 28.

The square root of 1023431239 is about 31991.1118750193. Note that the first 3 decimals coincide. The cubic root of 1023431239 is about 1007.7501923456.

The spelling of 1023431239 in words is "one billion, twenty-three million, four hundred thirty-one thousand, two hundred thirty-nine".