2506321 has 2 divisors, whose sum is σ = 2506322. Its totient is φ = 2506320.

The previous prime is 2506313. The next prime is 2506337. The reversal of 2506321 is 1236052.

It is a happy number.

2506321 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., 2070721 + 435600 = 1439^2 + 660^2 .

It is a cyclic number.

It is not a de Polignac number, because 2506321 - 2³ = 2506313 is a prime.

It is a Chen prime.

It is an Ulam number.

It is equal to p₁₈₃₅₀₂ and since 2506321 and 183502 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (2506391) 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, 1253160 + 1253161.

It is an arithmetic number, because the mean of its divisors is an integer number (1253161).

2^2506321 is an apocalyptic number.

It is an amenable number.

2506321 is a deficient number, since it is larger than the sum of its proper divisors (1).

2506321 is an equidigital number, since it uses as much as digits as its factorization.

2506321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 2506321 is about 1583.1364438986. The cubic root of 2506321 is about 135.8351701191.

The spelling of 2506321 in words is "two million, five hundred six thousand, three hundred twenty-one".