1491320047 has 12 divisors (see below), whose sum is σ = 1735784976. Its totient is φ = 1277549280.

The previous prime is 1491320027. The next prime is 1491320093. The reversal of 1491320047 is 7400231941.

It is not a de Polignac number, because 1491320047 - 2⁷ = 1491319919 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 (1491320027) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 90022 + ... + 105292.

It is an arithmetic number, because the mean of its divisors is an integer number (144648748).

Almost surely, 2^1491320047 is an apocalyptic number.

1491320047 is a deficient number, since it is larger than the sum of its proper divisors (244464929).

1491320047 is a wasteful number, since it uses less digits than its factorization.

1491320047 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17278 (or 17271 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 1491320047 is about 38617.6131706764. The cubic root of 1491320047 is about 1142.5019551892.

Adding to 1491320047 its reverse (7400231941), we get a palindrome (8891551988).

The spelling of 1491320047 in words is "one billion, four hundred ninety-one million, three hundred twenty thousand, forty-seven".