2689657 has 2 divisors, whose sum is σ = 2689658. Its totient is φ = 2689656.

The previous prime is 2689651. The next prime is 2689667. The reversal of 2689657 is 7569862.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2499561 + 190096 = 1581^2 + 436^2 .

It is a cyclic number.

It is not a de Polignac number, because 2689657 - 2³ = 2689649 is a prime.

It is a nialpdrome in base 12.

It is not a weakly prime, because it can be changed into another prime (2689651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1344828 + 1344829.

It is an arithmetic number, because the mean of its divisors is an integer number (1344829).

2^2689657 is an apocalyptic number.

It is an amenable number.

2689657 is a deficient number, since it is larger than the sum of its proper divisors (1).

2689657 is an equidigital number, since it uses as much as digits as its factorization.

2689657 is an evil number, because the sum of its binary digits is even.

The product of its digits is 181440, while the sum is 43.

The square root of 2689657 is about 1640.0173779567. The cubic root of 2689657 is about 139.0696302450.

The spelling of 2689657 in words is "two million, six hundred eighty-nine thousand, six hundred fifty-seven".