1020351866 has 16 divisors (see below), whose sum is σ = 1651138344. Its totient is φ = 471105024.

The previous prime is 1020351833. The next prime is 1020351869. The reversal of 1020351866 is 6681530201.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 969014641 + 51337225 = 31129^2 + 7165^2 .

It is a super-3 number, since 3×1020351866³ (a number of 28 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1020351869) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 281315 + ... + 284918.

Almost surely, 2^1020351866 is an apocalyptic number.

1020351866 is a deficient number, since it is larger than the sum of its proper divisors (630786478).

1020351866 is a wasteful number, since it uses less digits than its factorization.

1020351866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 566305.

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 1020351866 is about 31942.9470462573. The cubic root of 1020351866 is about 1006.7384466796.

The spelling of 1020351866 in words is "one billion, twenty million, three hundred fifty-one thousand, eight hundred sixty-six".