2193931 has 4 divisors (see below), whose sum is σ = 2198664. Its totient is φ = 2189200.

The previous prime is 2193929. The next prime is 2193941. The reversal of 2193931 is 1393912.

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 2193931 - 2¹ = 2193929 is a prime.

It is a super-2 number, since 2×2193931² = 9626666465522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2193931.

It is not an unprimeable number, because it can be changed into a prime (2193941) 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, 1585 + ... + 2626.

It is an arithmetic number, because the mean of its divisors is an integer number (549666).

2^2193931 is an apocalyptic number.

2193931 is a deficient number, since it is larger than the sum of its proper divisors (4733).

2193931 is an equidigital number, since it uses as much as digits as its factorization.

2193931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4732.

The product of its digits is 1458, while the sum is 28.

The square root of 2193931 is about 1481.1924250414. The cubic root of 2193931 is about 129.9394392477.

The spelling of 2193931 in words is "two million, one hundred ninety-three thousand, nine hundred thirty-one".