2012001989 has 4 divisors (see below), whose sum is σ = 2012291424. Its totient is φ = 2011712556.

The previous prime is 2012001967. The next prime is 2012002001. The reversal of 2012001989 is 9891002102.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2012001989 is a prime.

It is a super-2 number, since 2×2012001989² = 8096304007479912242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2012001689) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 134027 + ... + 148280.

It is an arithmetic number, because the mean of its divisors is an integer number (503072856).

Almost surely, 2^2012001989 is an apocalyptic number.

It is an amenable number.

2012001989 is a deficient number, since it is larger than the sum of its proper divisors (289435).

2012001989 is an equidigital number, since it uses as much as digits as its factorization.

2012001989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 289434.

The product of its (nonzero) digits is 2592, while the sum is 32.

The square root of 2012001989 is about 44855.3451552878. The cubic root of 2012001989 is about 1262.4362850439.

The spelling of 2012001989 in words is "two billion, twelve million, one thousand, nine hundred eighty-nine".