1491601 has 2 divisors, whose sum is σ = 1491602. Its totient is φ = 1491600.

The previous prime is 1491587. The next prime is 1491629. The reversal of 1491601 is 1061941.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1476225 + 15376 = 1215^2 + 124^2 .

It is a cyclic number.

It is not a de Polignac number, because 1491601 - 2¹⁷ = 1360529 is a prime.

1491601 is a lucky number.

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, 745800 + 745801.

It is an arithmetic number, because the mean of its divisors is an integer number (745801).

2^1491601 is an apocalyptic number.

It is an amenable number.

1491601 is a deficient number, since it is larger than the sum of its proper divisors (1).

1491601 is an equidigital number, since it uses as much as digits as its factorization.

1491601 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 22.

The square root of 1491601 is about 1221.3111806579. The cubic root of 1491601 is about 114.2573696820.

The spelling of 1491601 in words is "one million, four hundred ninety-one thousand, six hundred one".