2911993 has 4 divisors (see below), whose sum is σ = 3328000. Its totient is φ = 2495988.

The previous prime is 2911973. The next prime is 2912009. The reversal of 2911993 is 3991192.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2911993 - 2⁹ = 2911481 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 12.

It is not an unprimeable number, because it can be changed into a prime (2911903) 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, 207993 + ... + 208006.

It is an arithmetic number, because the mean of its divisors is an integer number (832000).

2^2911993 is an apocalyptic number.

It is an amenable number.

2911993 is a deficient number, since it is larger than the sum of its proper divisors (416007).

2911993 is an equidigital number, since it uses as much as digits as its factorization.

2911993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 416006.

The product of its digits is 4374, while the sum is 34.

The square root of 2911993 is about 1706.4562695833. The cubic root of 2911993 is about 142.8006252147.

The spelling of 2911993 in words is "two million, nine hundred eleven thousand, nine hundred ninety-three".