2891939123 has 4 divisors (see below), whose sum is σ = 2892522168. Its totient is φ = 2891356080.

The previous prime is 2891939087. The next prime is 2891939147. The reversal of 2891939123 is 3219391982.

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 2891939123 - 2¹⁰ = 2891938099 is a prime.

It is a super-2 number, since 2×2891939123² = 16726623782276018258, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2891939153) 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, 284018 + ... + 294023.

It is an arithmetic number, because the mean of its divisors is an integer number (723130542).

Almost surely, 2^2891939123 is an apocalyptic number.

2891939123 is a deficient number, since it is larger than the sum of its proper divisors (583045).

2891939123 is an equidigital number, since it uses as much as digits as its factorization.

2891939123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 583044.

The product of its digits is 209952, while the sum is 47.

The square root of 2891939123 is about 53776.7526260186. The cubic root of 2891939123 is about 1424.7206384551.

The spelling of 2891939123 in words is "two billion, eight hundred ninety-one million, nine hundred thirty-nine thousand, one hundred twenty-three".