2525781 has 4 divisors (see below), whose sum is σ = 3367712. Its totient is φ = 1683852.

The previous prime is 2525779. The next prime is 2525797. The reversal of 2525781 is 1875252.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 2525781 - 2¹ = 2525779 is a prime.

It is a super-2 number, since 2×2525781² = 12759139319922, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2525701) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 420961 + ... + 420966.

It is an arithmetic number, because the mean of its divisors is an integer number (841928).

2^2525781 is an apocalyptic number.

It is an amenable number.

2525781 is a deficient number, since it is larger than the sum of its proper divisors (841931).

2525781 is an equidigital number, since it uses as much as digits as its factorization.

2525781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 841930.

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

The square root of 2525781 is about 1589.2705874079. The cubic root of 2525781 is about 136.1858222567.

The spelling of 2525781 in words is "two million, five hundred twenty-five thousand, seven hundred eighty-one".