2190931 has 4 divisors (see below), whose sum is σ = 2200264. Its totient is φ = 2181600.

The previous prime is 2190901. The next prime is 2190959. The reversal of 2190931 is 1390912.

2190931 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 2190931 - 2¹⁷ = 2059859 is a prime.

It is a super-2 number, since 2×2190931² = 9600357293522, which contains 22 as substring.

It is a deceptive number, since it divides R_2190930.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2190896 and 2190905.

It is not an unprimeable number, because it can be changed into a prime (2190901) 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 3 ways as a sum of consecutive naturals, for example, 4305 + ... + 4786.

It is an arithmetic number, because the mean of its divisors is an integer number (550066).

2^2190931 is an apocalyptic number.

2190931 is a deficient number, since it is larger than the sum of its proper divisors (9333).

2190931 is an equidigital number, since it uses as much as digits as its factorization.

2190931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9332.

The product of its (nonzero) digits is 486, while the sum is 25.

The square root of 2190931 is about 1480.1793810211. The cubic root of 2190931 is about 129.8801854648.

The spelling of 2190931 in words is "two million, one hundred ninety thousand, nine hundred thirty-one".