1005601989 has 32 divisors (see below), whose sum is σ = 1573355520. Its totient is φ = 559383552.

The previous prime is 1005601973. The next prime is 1005601997. The reversal of 1005601989 is 9891065001.

1005601989 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1005601989 - 2⁴ = 1005601973 is a prime.

It is a super-2 number, since 2×1005601989² = 2022470720561512242, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1005601789) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 187852 + ... + 193130.

It is an arithmetic number, because the mean of its divisors is an integer number (49167360).

Almost surely, 2^1005601989 is an apocalyptic number.

It is an amenable number.

1005601989 is a deficient number, since it is larger than the sum of its proper divisors (567753531).

1005601989 is a wasteful number, since it uses less digits than its factorization.

1005601989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5529.

The product of its (nonzero) digits is 19440, while the sum is 39.

The square root of 1005601989 is about 31711.2281219129. The cubic root of 1005601989 is about 1001.8638535583.

The spelling of 1005601989 in words is "one billion, five million, six hundred one thousand, nine hundred eighty-nine".