1021889089 has 9 divisors (see below), whose sum is σ = 1106992803. Its totient is φ = 942898632.

The previous prime is 1021889081. The next prime is 1021889107. The reversal of 1021889089 is 9809881201.

The square root of 1021889089 is 31967.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 151167025 + 870722064 = 12295^2 + 29508^2 .

It is not a de Polignac number, because 1021889089 - 2³ = 1021889081 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1021889081) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 414342 + ... + 416800.

Almost surely, 2^1021889089 is an apocalyptic number.

1021889089 is the 31967-th square number.

1021889089 is the 15984-th centered octagonal number.

It is an amenable number.

1021889089 is a deficient number, since it is larger than the sum of its proper divisors (85103714).

1021889089 is an frugal number, since it uses more digits than its factorization.

1021889089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4944 (or 2472 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 46.

The cubic root of 1021889089 is about 1007.2437641819.

Multiplying 1021889089 by its product of nonzero digits (82944), we get a square (84759568598016 = 9206496²).

The spelling of 1021889089 in words is "one billion, twenty-one million, eight hundred eighty-nine thousand, eighty-nine".