916507521 has 16 divisors (see below), whose sum is σ = 1359198720. Its totient is φ = 610370640.

The previous prime is 916507513. The next prime is 916507531. The reversal of 916507521 is 125705619.

It is not a de Polignac number, because 916507521 - 2³ = 916507513 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (916507531) 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 15 ways as a sum of consecutive naturals, for example, 9631 + ... + 43883.

It is an arithmetic number, because the mean of its divisors is an integer number (84949920).

Almost surely, 2^916507521 is an apocalyptic number.

It is an amenable number.

916507521 is a deficient number, since it is larger than the sum of its proper divisors (442691199).

916507521 is a wasteful number, since it uses less digits than its factorization.

916507521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35253 (or 35247 counting only the distinct ones).

The product of its (nonzero) digits is 18900, while the sum is 36.

The square root of 916507521 is about 30273.8752227065. The cubic root of 916507521 is about 971.3565605121.

The spelling of 916507521 in words is "nine hundred sixteen million, five hundred seven thousand, five hundred twenty-one".