1491649 has 2 divisors, whose sum is σ = 1491650. Its totient is φ = 1491648.

The previous prime is 1491643. The next prime is 1491653. The reversal of 1491649 is 9461941.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1488400 + 3249 = 1220^2 + 57^2 .

It is a cyclic number.

It is not a de Polignac number, because 1491649 - 2³ = 1491641 is a prime.

It is not a weakly prime, because it can be changed into another prime (1491641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 745824 + 745825.

It is an arithmetic number, because the mean of its divisors is an integer number (745825).

2^1491649 is an apocalyptic number.

It is an amenable number.

1491649 is a deficient number, since it is larger than the sum of its proper divisors (1).

1491649 is an equidigital number, since it uses as much as digits as its factorization.

1491649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7776, while the sum is 34.

The square root of 1491649 is about 1221.3308315113. The cubic root of 1491649 is about 114.2585952767.

The spelling of 1491649 in words is "one million, four hundred ninety-one thousand, six hundred forty-nine".