1431691 has 4 divisors (see below), whose sum is σ = 1440432. Its totient is φ = 1422952.

The previous prime is 1431659. The next prime is 1431713. The reversal of 1431691 is 1961341.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1431691 - 2⁵ = 1431659 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1431601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4120 + ... + 4453.

It is an arithmetic number, because the mean of its divisors is an integer number (360108).

2^1431691 is an apocalyptic number.

1431691 is a deficient number, since it is larger than the sum of its proper divisors (8741).

1431691 is an equidigital number, since it uses as much as digits as its factorization.

1431691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8740.

The product of its digits is 648, while the sum is 25.

The square root of 1431691 is about 1196.5329080305. The cubic root of 1431691 is about 112.7067080269.

The spelling of 1431691 in words is "one million, four hundred thirty-one thousand, six hundred ninety-one".