2001669949 has 4 divisors (see below), whose sum is σ = 2001949600. Its totient is φ = 2001390300.

The previous prime is 2001669937. The next prime is 2001669953. The reversal of 2001669949 is 9499661002.

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 not a de Polignac number, because 2001669949 - 2¹¹ = 2001667901 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2001669899 and 2001669908.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001669149) 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, 128799 + ... + 143500.

It is an arithmetic number, because the mean of its divisors is an integer number (500487400).

Almost surely, 2^2001669949 is an apocalyptic number.

It is an amenable number.

2001669949 is a deficient number, since it is larger than the sum of its proper divisors (279651).

2001669949 is an equidigital number, since it uses as much as digits as its factorization.

2001669949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 279650.

The product of its (nonzero) digits is 209952, while the sum is 46.

The square root of 2001669949 is about 44740.0262516687. The cubic root of 2001669949 is about 1260.2716196569.

The spelling of 2001669949 in words is "two billion, one million, six hundred sixty-nine thousand, nine hundred forty-nine".