2505557 has 2 divisors, whose sum is σ = 2505558. Its totient is φ = 2505556.

The previous prime is 2505541. The next prime is 2505611. The reversal of 2505557 is 7555052.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2430481 + 75076 = 1559^2 + 274^2 .

It is a cyclic number.

It is not a de Polignac number, because 2505557 - 2⁴ = 2505541 is a prime.

It is equal to p₁₈₃₄₅₈ and since 2505557 and 183458 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2505527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1252778 + 1252779.

It is an arithmetic number, because the mean of its divisors is an integer number (1252779).

2^2505557 is an apocalyptic number.

It is an amenable number.

2505557 is a deficient number, since it is larger than the sum of its proper divisors (1).

2505557 is an equidigital number, since it uses as much as digits as its factorization.

2505557 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8750, while the sum is 29.

The square root of 2505557 is about 1582.8951323445. The cubic root of 2505557 is about 135.8213665379.

It can be divided in two parts, 2505 and 557, that multiplied together give a triangular number (1395285 = T₁₆₇₀).

The spelling of 2505557 in words is "two million, five hundred five thousand, five hundred fifty-seven".