491508915 has 16 divisors (see below), whose sum is σ = 788676000. Its totient is φ = 261384192.

The previous prime is 491508841. The next prime is 491508949. The reversal of 491508915 is 519805194.

It is not a de Polignac number, because 491508915 - 2¹⁴ = 491492531 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41710 + ... + 52179.

It is an arithmetic number, because the mean of its divisors is an integer number (49292250).

Almost surely, 2^491508915 is an apocalyptic number.

491508915 is a deficient number, since it is larger than the sum of its proper divisors (297167085).

491508915 is a wasteful number, since it uses less digits than its factorization.

491508915 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94246.

The product of its (nonzero) digits is 64800, while the sum is 42.

The square root of 491508915 is about 22170.0003382950. Note that the first 3 decimals coincide. The cubic root of 491508915 is about 789.1819310240.

The spelling of 491508915 in words is "four hundred ninety-one million, five hundred eight thousand, nine hundred fifteen".