1431240989 has 2 divisors, whose sum is σ = 1431240990. Its totient is φ = 1431240988.

The previous prime is 1431240947. The next prime is 1431241027. The reversal of 1431240989 is 9890421341.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1053521764 + 377719225 = 32458^2 + 19435^2 .

It is a cyclic number.

It is not a de Polignac number, because 1431240989 - 2¹⁶ = 1431175453 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1431240289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 715620494 + 715620495.

It is an arithmetic number, because the mean of its divisors is an integer number (715620495).

Almost surely, 2^1431240989 is an apocalyptic number.

It is an amenable number.

1431240989 is a deficient number, since it is larger than the sum of its proper divisors (1).

1431240989 is an equidigital number, since it uses as much as digits as its factorization.

1431240989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 62208, while the sum is 41.

The square root of 1431240989 is about 37831.7457831383. The cubic root of 1431240989 is about 1126.9489808252.

The spelling of 1431240989 in words is "one billion, four hundred thirty-one million, two hundred forty thousand, nine hundred eighty-nine".