1491153065 has 4 divisors (see below), whose sum is σ = 1789383684. Its totient is φ = 1192922448.

The previous prime is 1491153047. The next prime is 1491153071. The reversal of 1491153065 is 5603511941.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 979126681 + 512026384 = 31291^2 + 22628^2 .

It is a cyclic number.

It is not a de Polignac number, because 1491153065 - 2¹⁴ = 1491136681 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 149115302 + ... + 149115311.

It is an arithmetic number, because the mean of its divisors is an integer number (447345921).

Almost surely, 2^1491153065 is an apocalyptic number.

It is an amenable number.

1491153065 is a deficient number, since it is larger than the sum of its proper divisors (298230619).

1491153065 is an equidigital number, since it uses as much as digits as its factorization.

1491153065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 298230618.

The product of its (nonzero) digits is 16200, while the sum is 35.

The square root of 1491153065 is about 38615.4511173960. The cubic root of 1491153065 is about 1142.4593118986.

It can be divided in two parts, 14911 and 53065, that added together give a palindrome (67976).

The spelling of 1491153065 in words is "one billion, four hundred ninety-one million, one hundred fifty-three thousand, sixty-five".