1431649 has 2 divisors, whose sum is σ = 1431650. Its totient is φ = 1431648.

The previous prime is 1431637. The next prime is 1431659. The reversal of 1431649 is 9461341.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1000000 + 431649 = 1000^2 + 657^2 .

It is an emirp because it is prime and its reverse (9461341) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1431649 - 2¹¹ = 1429601 is a prime.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (1431659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 715824 + 715825.

It is an arithmetic number, because the mean of its divisors is an integer number (715825).

2^1431649 is an apocalyptic number.

It is an amenable number.

1431649 is a deficient number, since it is larger than the sum of its proper divisors (1).

1431649 is an equidigital number, since it uses as much as digits as its factorization.

1431649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2592, while the sum is 28.

The square root of 1431649 is about 1196.5153571935. The cubic root of 1431649 is about 112.7056058971.

It can be divided in two parts, 14316 and 49, that added together give a triangular number (14365 = T₁₆₉).

The spelling of 1431649 in words is "one million, four hundred thirty-one thousand, six hundred forty-nine".