1431397687 has 2 divisors, whose sum is σ = 1431397688. Its totient is φ = 1431397686.

The previous prime is 1431397679. The next prime is 1431397691. The reversal of 1431397687 is 7867931341.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1431397687 - 2³ = 1431397679 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1431397687.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1431397607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 715698843 + 715698844.

It is an arithmetic number, because the mean of its divisors is an integer number (715698844).

Almost surely, 2^1431397687 is an apocalyptic number.

1431397687 is a deficient number, since it is larger than the sum of its proper divisors (1).

1431397687 is an equidigital number, since it uses as much as digits as its factorization.

1431397687 is an evil number, because the sum of its binary digits is even.

The product of its digits is 762048, while the sum is 49.

The square root of 1431397687 is about 37833.8167120369. The cubic root of 1431397687 is about 1126.9901069548.

The spelling of 1431397687 in words is "one billion, four hundred thirty-one million, three hundred ninety-seven thousand, six hundred eighty-seven".