2101601 has 4 divisors (see below), whose sum is σ = 2174100. Its totient is φ = 2029104.

The previous prime is 2101553. The next prime is 2101607. The reversal of 2101601 is 1061012.

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 564001 + 1537600 = 751^2 + 1240^2 .

It is a cyclic number.

It is not a de Polignac number, because 2101601 - 2¹⁴ = 2085217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2101607) 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, 36206 + ... + 36263.

It is an arithmetic number, because the mean of its divisors is an integer number (543525).

2^2101601 is an apocalyptic number.

It is an amenable number.

2101601 is a deficient number, since it is larger than the sum of its proper divisors (72499).

2101601 is an equidigital number, since it uses as much as digits as its factorization.

2101601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72498.

The product of its (nonzero) digits is 12, while the sum is 11.

The square root of 2101601 is about 1449.6899668550. The cubic root of 2101601 is about 128.0904512043.

Adding to 2101601 its reverse (1061012), we get a palindrome (3162613).

The spelling of 2101601 in words is "two million, one hundred one thousand, six hundred one".