2141989391 has 4 divisors (see below), whose sum is σ = 2142124800. Its totient is φ = 2141853984.

The previous prime is 2141989309. The next prime is 2141989417. The reversal of 2141989391 is 1939891412.

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

It is a cyclic number.

It is not a de Polignac number, because 2141989391 - 2²² = 2137795087 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2141989991) 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, 40271 + ... + 76848.

It is an arithmetic number, because the mean of its divisors is an integer number (535531200).

Almost surely, 2^2141989391 is an apocalyptic number.

2141989391 is a deficient number, since it is larger than the sum of its proper divisors (135409).

2141989391 is a wasteful number, since it uses less digits than its factorization.

2141989391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135408.

The product of its digits is 139968, while the sum is 47.

The square root of 2141989391 is about 46281.6312482609. The cubic root of 2141989391 is about 1289.0579406896.

The spelling of 2141989391 in words is "two billion, one hundred forty-one million, nine hundred eighty-nine thousand, three hundred ninety-one".