2137565 has 4 divisors (see below), whose sum is σ = 2565084. Its totient is φ = 1710048.

The previous prime is 2137549. The next prime is 2137571. The reversal of 2137565 is 5657312.

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 784996 + 1352569 = 886^2 + 1163^2 .

It is a cyclic number.

It is not a de Polignac number, because 2137565 - 2⁴ = 2137549 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 213752 + ... + 213761.

It is an arithmetic number, because the mean of its divisors is an integer number (641271).

2^2137565 is an apocalyptic number.

It is an amenable number.

2137565 is a deficient number, since it is larger than the sum of its proper divisors (427519).

2137565 is an equidigital number, since it uses as much as digits as its factorization.

2137565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 427518.

The product of its digits is 6300, while the sum is 29.

The square root of 2137565 is about 1462.0413810833. The cubic root of 2137565 is about 128.8169790059.

The spelling of 2137565 in words is "two million, one hundred thirty-seven thousand, five hundred sixty-five".