2502781 has 2 divisors, whose sum is σ = 2502782. Its totient is φ = 2502780.

The previous prime is 2502779. The next prime is 2502793. The reversal of 2502781 is 1872052.

2502781 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2059225 + 443556 = 1435^2 + 666^2 .

It is a cyclic number.

It is not a de Polignac number, because 2502781 - 2¹ = 2502779 is a prime.

It is a super-2 number, since 2×2502781² = 12527825467922, which contains 22 as substring.

Together with 2502779, it forms a pair of twin primes.

It is equal to p₁₈₃₂₆₅ and since 2502781 and 183265 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 (2502701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1251390 + 1251391.

It is an arithmetic number, because the mean of its divisors is an integer number (1251391).

2^2502781 is an apocalyptic number.

2502781 is the 708-th centered decagonal number.

It is an amenable number.

2502781 is a deficient number, since it is larger than the sum of its proper divisors (1).

2502781 is an equidigital number, since it uses as much as digits as its factorization.

2502781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1120, while the sum is 25.

The square root of 2502781 is about 1582.0180150681. The cubic root of 2502781 is about 135.7711874833.

The spelling of 2502781 in words is "two million, five hundred two thousand, seven hundred eighty-one".