2011689947 has 4 divisors (see below), whose sum is σ = 2011964256. Its totient is φ = 2011415640.

The previous prime is 2011689907. The next prime is 2011689949. The reversal of 2011689947 is 7499861102.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2011689947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2011689949) 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, 125843 + ... + 140924.

It is an arithmetic number, because the mean of its divisors is an integer number (502991064).

Almost surely, 2^2011689947 is an apocalyptic number.

2011689947 is a deficient number, since it is larger than the sum of its proper divisors (274309).

2011689947 is an equidigital number, since it uses as much as digits as its factorization.

2011689947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 274308.

The product of its (nonzero) digits is 217728, while the sum is 47.

The square root of 2011689947 is about 44851.8667058574. The cubic root of 2011689947 is about 1262.3710177939.

The spelling of 2011689947 in words is "two billion, eleven million, six hundred eighty-nine thousand, nine hundred forty-seven".