1491367505 has 4 divisors (see below), whose sum is σ = 1789641012. Its totient is φ = 1193094000.

The previous prime is 1491367487. The next prime is 1491367511. The reversal of 1491367505 is 5057631941.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 467943424 + 1023424081 = 21632^2 + 31991^2 .

It is not a de Polignac number, because 1491367505 - 2²⁸ = 1222932049 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 149136746 + ... + 149136755.

It is an arithmetic number, because the mean of its divisors is an integer number (447410253).

Almost surely, 2^1491367505 is an apocalyptic number.

It is an amenable number.

1491367505 is a deficient number, since it is larger than the sum of its proper divisors (298273507).

1491367505 is an equidigital number, since it uses as much as digits as its factorization.

1491367505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 298273506.

The product of its (nonzero) digits is 113400, while the sum is 41.

The square root of 1491367505 is about 38618.2276263425. The cubic root of 1491367505 is about 1142.5140742696.

The spelling of 1491367505 in words is "one billion, four hundred ninety-one million, three hundred sixty-seven thousand, five hundred five".