1491078871 has 4 divisors (see below), whose sum is σ = 1493442544. Its totient is φ = 1488715200.

The previous prime is 1491078863. The next prime is 1491078887. The reversal of 1491078871 is 1788701941.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1788701941 = 13 ⋅137592457.

It is a cyclic number.

It is not a de Polignac number, because 1491078871 - 2³ = 1491078863 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 (1491078671) 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, 1180890 + ... + 1182151.

It is an arithmetic number, because the mean of its divisors is an integer number (373360636).

Almost surely, 2^1491078871 is an apocalyptic number.

1491078871 is a deficient number, since it is larger than the sum of its proper divisors (2363673).

1491078871 is an equidigital number, since it uses as much as digits as its factorization.

1491078871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2363672.

The product of its (nonzero) digits is 112896, while the sum is 46.

The square root of 1491078871 is about 38614.4904278174. The cubic root of 1491078871 is about 1142.4403634678.

The spelling of 1491078871 in words is "one billion, four hundred ninety-one million, seventy-eight thousand, eight hundred seventy-one".