1431231391 has 2 divisors, whose sum is σ = 1431231392. Its totient is φ = 1431231390.

The previous prime is 1431231293. The next prime is 1431231413. The reversal of 1431231391 is 1931321341.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1431231391 - 2¹¹ = 1431229343 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1431231491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 715615695 + 715615696.

It is an arithmetic number, because the mean of its divisors is an integer number (715615696).

Almost surely, 2^1431231391 is an apocalyptic number.

1431231391 is a deficient number, since it is larger than the sum of its proper divisors (1).

1431231391 is an equidigital number, since it uses as much as digits as its factorization.

1431231391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1944, while the sum is 28.

The square root of 1431231391 is about 37831.6189317877. The cubic root of 1431231391 is about 1126.9464616872.

The spelling of 1431231391 in words is "one billion, four hundred thirty-one million, two hundred thirty-one thousand, three hundred ninety-one".