2001669947 has 4 divisors (see below), whose sum is σ = 2119415256. Its totient is φ = 1883924640.

The previous prime is 2001669937. The next prime is 2001669953. The reversal of 2001669947 is 7499661002.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7499661002 = 2 ⋅3749830501.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2001669947 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2001669898 and 2001669907.

It is not an unprimeable number, because it can be changed into a prime (2001669937) 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, 58872629 + ... + 58872662.

It is an arithmetic number, because the mean of its divisors is an integer number (529853814).

Almost surely, 2^2001669947 is an apocalyptic number.

2001669947 is a deficient number, since it is larger than the sum of its proper divisors (117745309).

2001669947 is a wasteful number, since it uses less digits than its factorization.

2001669947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117745308.

The product of its (nonzero) digits is 163296, while the sum is 44.

The square root of 2001669947 is about 44740.0262293173. The cubic root of 2001669947 is about 1260.2716192372.

The spelling of 2001669947 in words is "two billion, one million, six hundred sixty-nine thousand, nine hundred forty-seven".