2197851 has 4 divisors (see below), whose sum is σ = 2930472. Its totient is φ = 1465232.

The previous prime is 2197849. The next prime is 2197873. The reversal of 2197851 is 1587912.

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 2197851 - 2¹ = 2197849 is a prime.

It is a D-number.

It is not an unprimeable number, because it can be changed into a prime (2197651) 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, 366306 + ... + 366311.

It is an arithmetic number, because the mean of its divisors is an integer number (732618).

2^2197851 is an apocalyptic number.

2197851 is a deficient number, since it is larger than the sum of its proper divisors (732621).

2197851 is an equidigital number, since it uses as much as digits as its factorization.

2197851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 732620.

The product of its digits is 5040, while the sum is 33.

The square root of 2197851 is about 1482.5150926719. The cubic root of 2197851 is about 130.0167828431.

The spelling of 2197851 in words is "two million, one hundred ninety-seven thousand, eight hundred fifty-one".