1491467391 has 16 divisors (see below), whose sum is σ = 2210241120. Its totient is φ = 994014720.

The previous prime is 1491467387. The next prime is 1491467401. The reversal of 1491467391 is 1937641941.

It is a happy number.

1491467391 is a `hidden beast` number, since 1 + 491 + 4 + 6 + 73 + 91 = 666.

It is not a de Polignac number, because 1491467391 - 2² = 1491467387 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1491467321) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 120261 + ... + 132081.

It is an arithmetic number, because the mean of its divisors is an integer number (138140070).

Almost surely, 2^1491467391 is an apocalyptic number.

1491467391 is a deficient number, since it is larger than the sum of its proper divisors (718773729).

1491467391 is a wasteful number, since it uses less digits than its factorization.

1491467391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16503 (or 16497 counting only the distinct ones).

The product of its digits is 163296, while the sum is 45.

The square root of 1491467391 is about 38619.5208540966. The cubic root of 1491467391 is about 1142.5395807511.

The spelling of 1491467391 in words is "one billion, four hundred ninety-one million, four hundred sixty-seven thousand, three hundred ninety-one".