1509491 has 2 divisors, whose sum is σ = 1509492. Its totient is φ = 1509490.

The previous prime is 1509463. The next prime is 1509509. The reversal of 1509491 is 1949051.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1509491 - 2⁶ = 1509427 is a prime.

It is not a weakly prime, because it can be changed into another prime (1500491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 754745 + 754746.

It is an arithmetic number, because the mean of its divisors is an integer number (754746).

2^1509491 is an apocalyptic number.

1509491 is a deficient number, since it is larger than the sum of its proper divisors (1).

1509491 is an equidigital number, since it uses as much as digits as its factorization.

1509491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1620, while the sum is 29.

The square root of 1509491 is about 1228.6134461253. The cubic root of 1509491 is about 114.7123497817.

The spelling of 1509491 in words is "one million, five hundred nine thousand, four hundred ninety-one".