1000781216 has 12 divisors (see below), whose sum is σ = 1970288082. Its totient is φ = 500390592.

The previous prime is 1000781161. The next prime is 1000781239. The reversal of 1000781216 is 6121870001.

It can be written as a sum of positive squares in only one way, i.e., 655564816 + 345216400 = 25604^2 + 18580^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15637175 + ... + 15637238.

Almost surely, 2^1000781216 is an apocalyptic number.

1000781216 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1000781216 is a deficient number, since it is larger than the sum of its proper divisors (969506866).

1000781216 is an equidigital number, since it uses as much as digits as its factorization.

1000781216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31274423 (or 31274415 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 26.

The square root of 1000781216 is about 31635.1262997321. The cubic root of 1000781216 is about 1000.2603375518.

The spelling of 1000781216 in words is "one billion, seven hundred eighty-one thousand, two hundred sixteen".