2135261 has 4 divisors (see below), whose sum is σ = 2157372. Its totient is φ = 2113152.

The previous prime is 2135227. The next prime is 2135267. The reversal of 2135261 is 1625312.

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 1223236 + 912025 = 1106^2 + 955^2 .

It is a cyclic number.

It is not a de Polignac number, because 2135261 - 2⁶ = 2135197 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2135267) 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, 10910 + ... + 11103.

It is an arithmetic number, because the mean of its divisors is an integer number (539343).

2^2135261 is an apocalyptic number.

It is an amenable number.

2135261 is a deficient number, since it is larger than the sum of its proper divisors (22111).

2135261 is an equidigital number, since it uses as much as digits as its factorization.

2135261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22110.

The product of its digits is 360, while the sum is 20.

The square root of 2135261 is about 1461.2532292522. The cubic root of 2135261 is about 128.7706800602.

The spelling of 2135261 in words is "two million, one hundred thirty-five thousand, two hundred sixty-one".