1018959021 has 42 divisors (see below), whose sum is σ = 1571683722. Its totient is φ = 660299040.

The previous prime is 1018958959. The next prime is 1018959031. The reversal of 1018959021 is 1209598101.

It can be written as a sum of positive squares in 3 ways, for example, as 614345796 + 404613225 = 24786^2 + 20115^2 .

It is not a de Polignac number, because 1018959021 - 2⁶ = 1018958957 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1018959031) by changing a digit.

It is a polite number, since it can be written in 41 ways as a sum of consecutive naturals, for example, 997491 + ... + 998511.

It is an arithmetic number, because the mean of its divisors is an integer number (37421041).

Almost surely, 2^1018959021 is an apocalyptic number.

It is an amenable number.

1018959021 is a deficient number, since it is larger than the sum of its proper divisors (552724701).

1018959021 is an frugal number, since it uses more digits than its factorization.

1018959021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1113 (or 1061 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 36.

The square root of 1018959021 is about 31921.1375267236. The cubic root of 1018959021 is about 1006.2801508088.

The spelling of 1018959021 in words is "one billion, eighteen million, nine hundred fifty-nine thousand, twenty-one".