916215287 has 4 divisors (see below), whose sum is σ = 986693400. Its totient is φ = 845737176.

The previous prime is 916215253. The next prime is 916215317. The reversal of 916215287 is 782512619.

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

It is a cyclic number.

It is not a de Polignac number, because 916215287 - 2²² = 912020983 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (916215247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35239037 + ... + 35239062.

It is an arithmetic number, because the mean of its divisors is an integer number (246673350).

Almost surely, 2^916215287 is an apocalyptic number.

916215287 is a deficient number, since it is larger than the sum of its proper divisors (70478113).

916215287 is a wasteful number, since it uses less digits than its factorization.

916215287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70478112.

The product of its digits is 60480, while the sum is 41.

The square root of 916215287 is about 30269.0483332397. The cubic root of 916215287 is about 971.2533085538.

The spelling of 916215287 in words is "nine hundred sixteen million, two hundred fifteen thousand, two hundred eighty-seven".