1521491 has 2 divisors, whose sum is σ = 1521492. Its totient is φ = 1521490.

The previous prime is 1521479. The next prime is 1521497. The reversal of 1521491 is 1941251.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1521491 - 2¹⁴ = 1505107 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1521497) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 760745 + 760746.

It is an arithmetic number, because the mean of its divisors is an integer number (760746).

2^1521491 is an apocalyptic number.

1521491 is a deficient number, since it is larger than the sum of its proper divisors (1).

1521491 is an equidigital number, since it uses as much as digits as its factorization.

1521491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 360, while the sum is 23.

The square root of 1521491 is about 1233.4873327278. The cubic root of 1521491 is about 115.0155240543.

The spelling of 1521491 in words is "one million, five hundred twenty-one thousand, four hundred ninety-one".