25421641 has 6 divisors (see below), whose sum is σ = 29572170. Its totient is φ = 21789936.

The previous prime is 25421633. The next prime is 25421657. The reversal of 25421641 is 14612452.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 15366400 + 10055241 = 3920^2 + 3171^2 .

It is not a de Polignac number, because 25421641 - 2³ = 25421633 is a prime.

It is a super-2 number, since 2×25421641² = 1292519662265762, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25421611) 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 in 5 ways as a sum of consecutive naturals, for example, 259356 + ... + 259453.

It is an arithmetic number, because the mean of its divisors is an integer number (4928695).

Almost surely, 2^25421641 is an apocalyptic number.

It is an amenable number.

25421641 is a deficient number, since it is larger than the sum of its proper divisors (4150529).

25421641 is an equidigital number, since it uses as much as digits as its factorization.

25421641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 518823 (or 518816 counting only the distinct ones).

The product of its digits is 1920, while the sum is 25.

The square root of 25421641 is about 5041.9878024446. The cubic root of 25421641 is about 294.0364656205.

It can be divided in two parts, 25421 and 641, that added together give a palindrome (26062).

The spelling of 25421641 in words is "twenty-five million, four hundred twenty-one thousand, six hundred forty-one".