2551709 has 2 divisors, whose sum is σ = 2551710. Its totient is φ = 2551708.

The previous prime is 2551697. The next prime is 2551723. The reversal of 2551709 is 9071552.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2316484 + 235225 = 1522^2 + 485^2 .

It is a cyclic number.

It is not a de Polignac number, because 2551709 - 2¹² = 2547613 is a prime.

It is a super-2 number, since 2×2551709² = 13022437641362, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2551729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1275854 + 1275855.

It is an arithmetic number, because the mean of its divisors is an integer number (1275855).

2^2551709 is an apocalyptic number.

It is an amenable number.

2551709 is a deficient number, since it is larger than the sum of its proper divisors (1).

2551709 is an equidigital number, since it uses as much as digits as its factorization.

2551709 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3150, while the sum is 29.

The square root of 2551709 is about 1597.4069612970. The cubic root of 2551709 is about 136.6502346560.

The spelling of 2551709 in words is "two million, five hundred fifty-one thousand, seven hundred nine".