1491438817 has 8 divisors (see below), whose sum is σ = 1628165952. Its totient is φ = 1354902000.

The previous prime is 1491438811. The next prime is 1491438833. The reversal of 1491438817 is 7188341941.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1491438817 - 2¹¹ = 1491436769 is a prime.

It is a Duffinian 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 7 ways as a sum of consecutive naturals, for example, 30934 + ... + 62767.

It is an arithmetic number, because the mean of its divisors is an integer number (203520744).

Almost surely, 2^1491438817 is an apocalyptic number.

It is an amenable number.

1491438817 is a deficient number, since it is larger than the sum of its proper divisors (136727135).

1491438817 is a wasteful number, since it uses less digits than its factorization.

1491438817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95159.

The product of its digits is 193536, while the sum is 46.

The square root of 1491438817 is about 38619.1509098789. The cubic root of 1491438817 is about 1142.5322843273.

The spelling of 1491438817 in words is "one billion, four hundred ninety-one million, four hundred thirty-eight thousand, eight hundred seventeen".