2190101 has 4 divisors (see below), whose sum is σ = 2193900. Its totient is φ = 2186304.

The previous prime is 2190091. The next prime is 2190103. The reversal of 2190101 is 1010912.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1188100 + 1002001 = 1090^2 + 1001^2 .

It is a cyclic number.

It is not a de Polignac number, because 2190101 - 2¹⁸ = 1927957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2190103) 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, 836 + ... + 2253.

It is an arithmetic number, because the mean of its divisors is an integer number (548475).

2^2190101 is an apocalyptic number.

It is an amenable number.

2190101 is a deficient number, since it is larger than the sum of its proper divisors (3799).

2190101 is an equidigital number, since it uses as much as digits as its factorization.

2190101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3798.

The product of its (nonzero) digits is 18, while the sum is 14.

The square root of 2190101 is about 1479.8989830390. The cubic root of 2190101 is about 129.8637823665.

The spelling of 2190101 in words is "two million, one hundred ninety thousand, one hundred one".