1431397691 has 2 divisors, whose sum is σ = 1431397692. Its totient is φ = 1431397690.

The previous prime is 1431397687. The next prime is 1431397697. The reversal of 1431397691 is 1967931341.

It is a weak prime.

It is an emirp because it is prime and its reverse (1967931341) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1431397691 - 2² = 1431397687 is a prime.

It is a super-5 number, since 5×1431397691⁵ (a number of 47 digits) contains 55555 as substring.

It is not a weakly prime, because it can be changed into another prime (1431397697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 715698845 + 715698846.

It is an arithmetic number, because the mean of its divisors is an integer number (715698846).

Almost surely, 2^1431397691 is an apocalyptic number.

1431397691 is a deficient number, since it is larger than the sum of its proper divisors (1).

1431397691 is an equidigital number, since it uses as much as digits as its factorization.

1431397691 is an evil number, because the sum of its binary digits is even.

The product of its digits is 122472, while the sum is 44.

The square root of 1431397691 is about 37833.8167648996. The cubic root of 1431397691 is about 1126.9901080046.

The spelling of 1431397691 in words is "one billion, four hundred thirty-one million, three hundred ninety-seven thousand, six hundred ninety-one".