2016781001 has 8 divisors (see below), whose sum is σ = 2046089640. Its totient is φ = 1987517952.

The previous prime is 2016780991. The next prime is 2016781037. The reversal of 2016781001 is 1001876102.

It can be written as a sum of positive squares in 4 ways, for example, as 227406400 + 1789374601 = 15080^2 + 42301^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2016781001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2016786001) 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, 83381 + ... + 104813.

It is an arithmetic number, because the mean of its divisors is an integer number (255761205).

Almost surely, 2^2016781001 is an apocalyptic number.

It is an amenable number.

2016781001 is a deficient number, since it is larger than the sum of its proper divisors (29308639).

2016781001 is a wasteful number, since it uses less digits than its factorization.

2016781001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22795.

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

The square root of 2016781001 is about 44908.5849365130. The cubic root of 2016781001 is about 1263.4350295270.

The spelling of 2016781001 in words is "two billion, sixteen million, seven hundred eighty-one thousand, one".