1431339991 has 2 divisors, whose sum is σ = 1431339992. Its totient is φ = 1431339990.

The previous prime is 1431339989. The next prime is 1431340013. The reversal of 1431339991 is 1999331341.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1431339991 - 2¹ = 1431339989 is a prime.

Together with 1431339989, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1431331991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 715669995 + 715669996.

It is an arithmetic number, because the mean of its divisors is an integer number (715669996).

Almost surely, 2^1431339991 is an apocalyptic number.

1431339991 is a deficient number, since it is larger than the sum of its proper divisors (1).

1431339991 is an equidigital number, since it uses as much as digits as its factorization.

1431339991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 78732, while the sum is 43.

The square root of 1431339991 is about 37833.0542118925. The cubic root of 1431339991 is about 1126.9749647164.

The spelling of 1431339991 in words is "one billion, four hundred thirty-one million, three hundred thirty-nine thousand, nine hundred ninety-one".