2564381 has 2 divisors, whose sum is σ = 2564382. Its totient is φ = 2564380.

The previous prime is 2564369. The next prime is 2564407. The reversal of 2564381 is 1834652.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1428025 + 1136356 = 1195^2 + 1066^2 .

It is a cyclic number.

It is not a de Polignac number, because 2564381 - 2¹⁰ = 2563357 is a prime.

It is a super-2 number, since 2×2564381² = 13152099826322, 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 (2564321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1282190 + 1282191.

It is an arithmetic number, because the mean of its divisors is an integer number (1282191).

2^2564381 is an apocalyptic number.

It is an amenable number.

2564381 is a deficient number, since it is larger than the sum of its proper divisors (1).

2564381 is an equidigital number, since it uses as much as digits as its factorization.

2564381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5760, while the sum is 29.

The square root of 2564381 is about 1601.3684772719. The cubic root of 2564381 is about 136.8760667265.

The spelling of 2564381 in words is "two million, five hundred sixty-four thousand, three hundred eighty-one".