1491309 has 6 divisors (see below), whose sum is σ = 2154126. Its totient is φ = 994200.

The previous prime is 1491299. The next prime is 1491377. The reversal of 1491309 is 9031941.

It can be written as a sum of positive squares in only one way, i.e., 1447209 + 44100 = 1203^2 + 210^2 .

It is not a de Polignac number, because 1491309 - 2¹¹ = 1489261 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1491109) 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 5 ways as a sum of consecutive naturals, for example, 82842 + ... + 82859.

It is an arithmetic number, because the mean of its divisors is an integer number (359021).

2^1491309 is an apocalyptic number.

It is an amenable number.

1491309 is a deficient number, since it is larger than the sum of its proper divisors (662817).

1491309 is a wasteful number, since it uses less digits than its factorization.

1491309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165707 (or 165704 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 27.

The square root of 1491309 is about 1221.1916311538. The cubic root of 1491309 is about 114.2499134143.

The spelling of 1491309 in words is "one million, four hundred ninety-one thousand, three hundred nine".