2917991 has 8 divisors (see below), whose sum is σ = 2981664. Its totient is φ = 2855200.

The previous prime is 2917973. The next prime is 2918059. The reversal of 2917991 is 1997192.

2917991 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2917991 - 2⁶ = 2917927 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 (2917091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16781 + ... + 16953.

It is an arithmetic number, because the mean of its divisors is an integer number (372708).

2^2917991 is an apocalyptic number.

2917991 is a deficient number, since it is larger than the sum of its proper divisors (63673).

2917991 is a wasteful number, since it uses less digits than its factorization.

2917991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 441.

The product of its digits is 10206, while the sum is 38.

The square root of 2917991 is about 1708.2128087566. The cubic root of 2917991 is about 142.8986028711.

The spelling of 2917991 in words is "two million, nine hundred seventeen thousand, nine hundred ninety-one".