2191755 has 8 divisors (see below), whose sum is σ = 3506832. Its totient is φ = 1168928.

The previous prime is 2191727. The next prime is 2191799. The reversal of 2191755 is 5571912.

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 2191755 - 2⁵ = 2191723 is a prime.

2191755 is a lucky number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 73044 + ... + 73073.

It is an arithmetic number, because the mean of its divisors is an integer number (438354).

2^2191755 is an apocalyptic number.

2191755 is a deficient number, since it is larger than the sum of its proper divisors (1315077).

2191755 is a wasteful number, since it uses less digits than its factorization.

2191755 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146125.

The product of its digits is 3150, while the sum is 30.

The square root of 2191755 is about 1480.4576994970. The cubic root of 2191755 is about 129.8964658891.

The spelling of 2191755 in words is "two million, one hundred ninety-one thousand, seven hundred fifty-five".