2581257 has 16 divisors (see below), whose sum is σ = 3975552. Its totient is φ = 1459200.

The previous prime is 2581253. The next prime is 2581273. The reversal of 2581257 is 7521852.

It is not a de Polignac number, because 2581257 - 2² = 2581253 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2581253) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1513 + ... + 2729.

It is an arithmetic number, because the mean of its divisors is an integer number (248472).

2^2581257 is an apocalyptic number.

It is an amenable number.

2581257 is a deficient number, since it is larger than the sum of its proper divisors (1394295).

2581257 is a wasteful number, since it uses less digits than its factorization.

2581257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1328.

The product of its digits is 5600, while the sum is 30.

The square root of 2581257 is about 1606.6290797816. The cubic root of 2581257 is about 137.1756675280.

The spelling of 2581257 in words is "two million, five hundred eighty-one thousand, two hundred fifty-seven".