2141691887 has 4 divisors (see below), whose sum is σ = 2150224776. Its totient is φ = 2133159000.

The previous prime is 2141691863. The next prime is 2141691901. The reversal of 2141691887 is 7881961412.

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 2141691887 - 2¹² = 2141687791 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 (2141601887) 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, 4266068 + ... + 4266569.

It is an arithmetic number, because the mean of its divisors is an integer number (537556194).

Almost surely, 2^2141691887 is an apocalyptic number.

2141691887 is a deficient number, since it is larger than the sum of its proper divisors (8532889).

2141691887 is an equidigital number, since it uses as much as digits as its factorization.

2141691887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8532888.

The product of its digits is 193536, while the sum is 47.

The square root of 2141691887 is about 46278.4170753495. The cubic root of 2141691887 is about 1288.9982582201.

The spelling of 2141691887 in words is "two billion, one hundred forty-one million, six hundred ninety-one thousand, eight hundred eighty-seven".