1491438815 has 16 divisors (see below), whose sum is σ = 1930765248. Its totient is φ = 1101774336.

The previous prime is 1491438811. The next prime is 1491438833. The reversal of 1491438815 is 5188341941.

It is a cyclic number.

It is not a de Polignac number, because 1491438815 - 2² = 1491438811 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 (1491438811) 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, 161027 + ... + 170036.

It is an arithmetic number, because the mean of its divisors is an integer number (120672828).

Almost surely, 2^1491438815 is an apocalyptic number.

1491438815 is a deficient number, since it is larger than the sum of its proper divisors (439326433).

1491438815 is a wasteful number, since it uses less digits than its factorization.

1491438815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 331138.

The product of its digits is 138240, while the sum is 44.

The square root of 1491438815 is about 38619.1508839850. The cubic root of 1491438815 is about 1142.5322838166.

The spelling of 1491438815 in words is "one billion, four hundred ninety-one million, four hundred thirty-eight thousand, eight hundred fifteen".