1016915981 has 2 divisors, whose sum is σ = 1016915982. Its totient is φ = 1016915980.

The previous prime is 1016915969. The next prime is 1016916007. The reversal of 1016915981 is 1895196101.

It is a happy number.

1016915981 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1007491081 + 9424900 = 31741^2 + 3070^2 .

It is a cyclic number.

It is not a de Polignac number, because 1016915981 - 2¹⁸ = 1016653837 is a prime.

It is a super-2 number, since 2×1016915981² = 2068236224826384722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1016915941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 508457990 + 508457991.

It is an arithmetic number, because the mean of its divisors is an integer number (508457991).

Almost surely, 2^1016915981 is an apocalyptic number.

It is an amenable number.

1016915981 is a deficient number, since it is larger than the sum of its proper divisors (1).

1016915981 is an equidigital number, since it uses as much as digits as its factorization.

1016915981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 19440, while the sum is 41.

The square root of 1016915981 is about 31889.1201038850. The cubic root of 1016915981 is about 1005.6071613118.

The spelling of 1016915981 in words is "one billion, sixteen million, nine hundred fifteen thousand, nine hundred eighty-one".