2581357 has 2 divisors, whose sum is σ = 2581358. Its totient is φ = 2581356.

The previous prime is 2581349. The next prime is 2581367. The reversal of 2581357 is 7531852.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2499561 + 81796 = 1581^2 + 286^2 .

It is a cyclic number.

It is not a de Polignac number, because 2581357 - 2³ = 2581349 is a prime.

It is a super-2 number, since 2×2581357² = 13326807922898, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2581367) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1290678 + 1290679.

It is an arithmetic number, because the mean of its divisors is an integer number (1290679).

2^2581357 is an apocalyptic number.

It is an amenable number.

2581357 is a deficient number, since it is larger than the sum of its proper divisors (1).

2581357 is an equidigital number, since it uses as much as digits as its factorization.

2581357 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8400, while the sum is 31.

The square root of 2581357 is about 1606.6602005402. The cubic root of 2581357 is about 137.1774389375.

The spelling of 2581357 in words is "two million, five hundred eighty-one thousand, three hundred fifty-seven".