1491046519 has 4 divisors (see below), whose sum is σ = 1493463744. Its totient is φ = 1488629296.

The previous prime is 1491046517. The next prime is 1491046541. The reversal of 1491046519 is 9156401941.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9156401941 = 1109 ⋅8256449.

It is a cyclic number.

It is not a de Polignac number, because 1491046519 - 2¹ = 1491046517 is a prime.

It is a super-2 number, since 2×1491046519² = 4446439443644034722, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1491046517) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1207687 + ... + 1208920.

It is an arithmetic number, because the mean of its divisors is an integer number (373365936).

Almost surely, 2^1491046519 is an apocalyptic number.

1491046519 is a deficient number, since it is larger than the sum of its proper divisors (2417225).

1491046519 is an equidigital number, since it uses as much as digits as its factorization.

1491046519 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2417224.

The product of its (nonzero) digits is 38880, while the sum is 40.

The square root of 1491046519 is about 38614.0715154463. The cubic root of 1491046519 is about 1142.4321008827.

The spelling of 1491046519 in words is "one billion, four hundred ninety-one million, forty-six thousand, five hundred nineteen".