1020311989 has 12 divisors (see below), whose sum is σ = 1079016384. Its totient is φ = 964657512.

The previous prime is 1020311987. The next prime is 1020312061. The reversal of 1020311989 is 9891130201.

It is not a de Polignac number, because 1020311989 - 2¹ = 1020311987 is a prime.

It is a super-2 number, since 2×1020311989² = 2082073109794272242, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1020311987) 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 11 ways as a sum of consecutive naturals, for example, 194884 + ... + 200050.

It is an arithmetic number, because the mean of its divisors is an integer number (89918032).

Almost surely, 2^1020311989 is an apocalyptic number.

1020311989 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

1020311989 is a deficient number, since it is larger than the sum of its proper divisors (58704395).

1020311989 is an equidigital number, since it uses as much as digits as its factorization.

1020311989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5752 (or 5733 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 34.

The square root of 1020311989 is about 31942.3228491605. The cubic root of 1020311989 is about 1006.7253315202.

The spelling of 1020311989 in words is "one billion, twenty million, three hundred eleven thousand, nine hundred eighty-nine".