2190831 has 4 divisors (see below), whose sum is σ = 2921112. Its totient is φ = 1460552.

The previous prime is 2190829. The next prime is 2190857. The reversal of 2190831 is 1380912.

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 2190831 - 2¹ = 2190829 is a prime.

It is a super-2 number, since 2×2190831² = 9599480941122, which contains 22 as substring.

It is a D-number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2190821) 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, 365136 + ... + 365141.

It is an arithmetic number, because the mean of its divisors is an integer number (730278).

2^2190831 is an apocalyptic number.

2190831 is a deficient number, since it is larger than the sum of its proper divisors (730281).

2190831 is an equidigital number, since it uses as much as digits as its factorization.

2190831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 730280.

The product of its (nonzero) digits is 432, while the sum is 24.

The square root of 2190831 is about 1480.1456009461. The cubic root of 2190831 is about 129.8782094074.

The spelling of 2190831 in words is "two million, one hundred ninety thousand, eight hundred thirty-one".