1021489802 has 4 divisors (see below), whose sum is σ = 1532234706. Its totient is φ = 510744900.

The previous prime is 1021489801. The next prime is 1021489841. The reversal of 1021489802 is 2089841201.

1021489802 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2089841201 = 7 ⋅298548743.

It can be written as a sum of positive squares in only one way, i.e., 644702881 + 376786921 = 25391^2 + 19411^2 .

It is not an unprimeable number, because it can be changed into a prime (1021489801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 255372449 + ... + 255372452.

Almost surely, 2^1021489802 is an apocalyptic number.

1021489802 is a deficient number, since it is larger than the sum of its proper divisors (510744904).

1021489802 is an equidigital number, since it uses as much as digits as its factorization.

1021489802 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 510744903.

The product of its (nonzero) digits is 9216, while the sum is 35.

The square root of 1021489802 is about 31960.7540899773. The cubic root of 1021489802 is about 1007.1125589013.

The spelling of 1021489802 in words is "one billion, twenty-one million, four hundred eighty-nine thousand, eight hundred two".