1021967618 has 12 divisors (see below), whose sum is σ = 1783229382. Its totient is φ = 437986080.

The previous prime is 1021967581. The next prime is 1021967623. The reversal of 1021967618 is 8167691201.

It can be written as a sum of positive squares in only one way, i.e., 859838329 + 162129289 = 29323^2 + 12733^2 .

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5214023 + ... + 5214218.

Almost surely, 2^1021967618 is an apocalyptic number.

1021967618 is a deficient number, since it is larger than the sum of its proper divisors (761261764).

1021967618 is a wasteful number, since it uses less digits than its factorization.

1021967618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10428257 (or 10428250 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 41.

The square root of 1021967618 is about 31968.2282586946. The cubic root of 1021967618 is about 1007.2695647051.

The spelling of 1021967618 in words is "one billion, twenty-one million, nine hundred sixty-seven thousand, six hundred eighteen".