2135557 has 4 divisors (see below), whose sum is σ = 2261196. Its totient is φ = 2009920.

The previous prime is 2135537. The next prime is 2135563. The reversal of 2135557 is 7555312.

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 1153476 + 982081 = 1074^2 + 991^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2135557 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 (2135537) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 62794 + ... + 62827.

It is an arithmetic number, because the mean of its divisors is an integer number (565299).

2^2135557 is an apocalyptic number.

It is an amenable number.

2135557 is a deficient number, since it is larger than the sum of its proper divisors (125639).

2135557 is a wasteful number, since it uses less digits than its factorization.

2135557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125638.

The product of its digits is 5250, while the sum is 28.

The square root of 2135557 is about 1461.3545086665. The cubic root of 2135557 is about 128.7766300526.

It can be divided in two parts, 21355 and 57, that added together give a palindrome (21412).

The spelling of 2135557 in words is "two million, one hundred thirty-five thousand, five hundred fifty-seven".