1491491 has 2 divisors, whose sum is σ = 1491492. Its totient is φ = 1491490.

The previous prime is 1491449. The next prime is 1491493. The reversal of 1491491 is 1941941.

It is a strong prime.

It is an emirp because it is prime and its reverse (1941941) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1491491 is a prime.

Together with 1491493, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1491493) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 745745 + 745746.

It is an arithmetic number, because the mean of its divisors is an integer number (745746).

2^1491491 is an apocalyptic number.

1491491 is a deficient number, since it is larger than the sum of its proper divisors (1).

1491491 is an equidigital number, since it uses as much as digits as its factorization.

1491491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1296, while the sum is 29.

The square root of 1491491 is about 1221.2661462597. The cubic root of 1491491 is about 114.2545609283.

The spelling of 1491491 in words is "one million, four hundred ninety-one thousand, four hundred ninety-one".