2651689 has 4 divisors (see below), whose sum is σ = 2679124. Its totient is φ = 2624256.

The previous prime is 2651687. The next prime is 2651699. The reversal of 2651689 is 9861562.

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 1937664 + 714025 = 1392^2 + 845^2 .

It is a cyclic number.

It is not a de Polignac number, because 2651689 - 2¹ = 2651687 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2651683) 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, 13572 + ... + 13765.

It is an arithmetic number, because the mean of its divisors is an integer number (669781).

2^2651689 is an apocalyptic number.

It is an amenable number.

2651689 is a deficient number, since it is larger than the sum of its proper divisors (27435).

2651689 is an equidigital number, since it uses as much as digits as its factorization.

2651689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27434.

The product of its digits is 25920, while the sum is 37.

The square root of 2651689 is about 1628.4007492015. The cubic root of 2651689 is about 138.4121439275.

It can be divided in two parts, 26 and 51689, that added together give a palindrome (51715).

The spelling of 2651689 in words is "two million, six hundred fifty-one thousand, six hundred eighty-nine".