2525661 has 10 divisors (see below), whose sum is σ = 3773022. Its totient is φ = 1683720.

The previous prime is 2525647. The next prime is 2525669. The reversal of 2525661 is 1665252.

It can be written as a sum of positive squares in only one way, i.e., 1454436 + 1071225 = 1206^2 + 1035^2 .

It is not a de Polignac number, because 2525661 - 2⁵ = 2525629 is a prime.

It is a super-3 number, since 3×2525661³ = 48333297898021139343, which contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2525669) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 15510 + ... + 15671.

2^2525661 is an apocalyptic number.

It is an amenable number.

2525661 is a deficient number, since it is larger than the sum of its proper divisors (1247361).

2525661 is an equidigital number, since it uses as much as digits as its factorization.

2525661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31193 (or 31184 counting only the distinct ones).

The product of its digits is 3600, while the sum is 27.

The square root of 2525661 is about 1589.2328337912. The cubic root of 2525661 is about 136.1836654905.

The spelling of 2525661 in words is "two million, five hundred twenty-five thousand, six hundred sixty-one".