916069721 has 8 divisors (see below), whose sum is σ = 1071284544. Its totient is φ = 766941840.

The previous prime is 916069657. The next prime is 916069727. The reversal of 916069721 is 127960619.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 916069721 - 2⁶ = 916069657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (916069727) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1521410 + ... + 1522011.

It is an arithmetic number, because the mean of its divisors is an integer number (133910568).

Almost surely, 2^916069721 is an apocalyptic number.

It is an amenable number.

916069721 is a deficient number, since it is larger than the sum of its proper divisors (155214823).

916069721 is a wasteful number, since it uses less digits than its factorization.

916069721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3043471.

The product of its (nonzero) digits is 40824, while the sum is 41.

The square root of 916069721 is about 30266.6437022674. The cubic root of 916069721 is about 971.2018690616.

The spelling of 916069721 in words is "nine hundred sixteen million, sixty-nine thousand, seven hundred twenty-one".