2191078 has 8 divisors (see below), whose sum is σ = 3295368. Its totient is φ = 1092624.

The previous prime is 2191069. The next prime is 2191087. The reversal of 2191078 is 8701912.

It is an interprime number because it is at equal distance from previous prime (2191069) and next prime (2191087).

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 351 + ... + 2122.

It is an arithmetic number, because the mean of its divisors is an integer number (411921).

2^2191078 is an apocalyptic number.

2191078 is a deficient number, since it is larger than the sum of its proper divisors (1104290).

2191078 is a wasteful number, since it uses less digits than its factorization.

2191078 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2918.

The product of its (nonzero) digits is 1008, while the sum is 28.

The square root of 2191078 is about 1480.2290363319. The cubic root of 2191078 is about 129.8830901600.

The spelling of 2191078 in words is "two million, one hundred ninety-one thousand, seventy-eight".