916128279491 has 16 divisors (see below), whose sum is σ = 944331844608. Its totient is φ = 888294960000.

The previous prime is 916128279461. The next prime is 916128279533. The reversal of 916128279491 is 194972821619.

It is a cyclic number.

It is not a de Polignac number, because 916128279491 - 2⁶ = 916128279427 is a prime.

It is a super-2 number, since 2×916128279491² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 916128279491.

It is not an unprimeable number, because it can be changed into a prime (916128279401) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11916746 + ... + 11993376.

It is an arithmetic number, because the mean of its divisors is an integer number (59020740288).

Almost surely, 2^916128279491 is an apocalyptic number.

916128279491 is a deficient number, since it is larger than the sum of its proper divisors (28203565117).

916128279491 is a wasteful number, since it uses less digits than its factorization.

916128279491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79042.

The product of its digits is 3919104, while the sum is 59.

The spelling of 916128279491 in words is "nine hundred sixteen billion, one hundred twenty-eight million, two hundred seventy-nine thousand, four hundred ninety-one".