1491649065 has 24 divisors (see below), whose sum is σ = 2599983360. Its totient is φ = 791097504.

The previous prime is 1491649051. The next prime is 1491649069. The reversal of 1491649065 is 5609461941.

It is a happy number.

1491649065 is a `hidden beast` number, since 14 + 91 + 6 + 490 + 65 = 666.

It is not a de Polignac number, because 1491649065 - 2⁶ = 1491649001 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 1491649065.

It is not an unprimeable number, because it can be changed into a prime (1491649069) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 84537 + ... + 100646.

It is an arithmetic number, because the mean of its divisors is an integer number (108332640).

Almost surely, 2^1491649065 is an apocalyptic number.

1491649065 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1491649065 is a deficient number, since it is larger than the sum of its proper divisors (1108334295).

1491649065 is a wasteful number, since it uses less digits than its factorization.

1491649065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 185373 (or 185370 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 45.

The square root of 1491649065 is about 38621.8728831216. The cubic root of 1491649065 is about 1142.5859693635.

The spelling of 1491649065 in words is "one billion, four hundred ninety-one million, six hundred forty-nine thousand, sixty-five".