1021618158 has 64 divisors (see below), whose sum is σ = 2281789440. Its totient is φ = 302319200.

The previous prime is 1021618151. The next prime is 1021618159. The reversal of 1021618158 is 8518161201.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021618151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 649513 + ... + 651083.

It is an arithmetic number, because the mean of its divisors is an integer number (35652960).

Almost surely, 2^1021618158 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1021618158, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1140894720).

1021618158 is an abundant number, since it is smaller than the sum of its proper divisors (1260171282).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1021618158 is a wasteful number, since it uses less digits than its factorization.

1021618158 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1813.

The product of its (nonzero) digits is 3840, while the sum is 33.

The square root of 1021618158 is about 31962.7620521131. The cubic root of 1021618158 is about 1007.1547402738.

Adding to 1021618158 its reverse (8518161201), we get a palindrome (9539779359).

The spelling of 1021618158 in words is "one billion, twenty-one million, six hundred eighteen thousand, one hundred fifty-eight".