916539209 has 4 divisors (see below), whose sum is σ = 925105104. Its totient is φ = 907973316.

The previous prime is 916539199. The next prime is 916539257. The reversal of 916539209 is 902935619.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 916539209 - 2⁴ = 916539193 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 916539209.

It is not an unprimeable number, because it can be changed into a prime (916539289) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4282787 + ... + 4283000.

It is an arithmetic number, because the mean of its divisors is an integer number (231276276).

Almost surely, 2^916539209 is an apocalyptic number.

It is an amenable number.

916539209 is a deficient number, since it is larger than the sum of its proper divisors (8565895).

916539209 is a wasteful number, since it uses less digits than its factorization.

916539209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8565894.

The product of its (nonzero) digits is 131220, while the sum is 44.

The square root of 916539209 is about 30274.3985737124. The cubic root of 916539209 is about 971.3677551800.

The spelling of 916539209 in words is "nine hundred sixteen million, five hundred thirty-nine thousand, two hundred nine".