1491328287 has 16 divisors (see below), whose sum is σ = 2210262880. Its totient is φ = 993819456.

The previous prime is 1491328243. The next prime is 1491328331. The reversal of 1491328287 is 7828231941.

It is a happy number.

1491328287 is a `hidden beast` number, since 1 + 49 + 1 + 328 + 287 = 666.

It is an interprime number because it is at equal distance from previous prime (1491328243) and next prime (1491328331).

It is not a de Polignac number, because 1491328287 - 2²⁸ = 1222892831 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1491327287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 67473 + ... + 86805.

It is an arithmetic number, because the mean of its divisors is an integer number (138141430).

Almost surely, 2^1491328287 is an apocalyptic number.

1491328287 is a deficient number, since it is larger than the sum of its proper divisors (718934593).

1491328287 is a wasteful number, since it uses less digits than its factorization.

1491328287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22199 (or 22193 counting only the distinct ones).

The product of its digits is 193536, while the sum is 45.

The square root of 1491328287 is about 38617.7198575991. The cubic root of 1491328287 is about 1142.5040594097.

The spelling of 1491328287 in words is "one billion, four hundred ninety-one million, three hundred twenty-eight thousand, two hundred eighty-seven".