25281601 has 8 divisors (see below), whose sum is σ = 26908200. Its totient is φ = 23670528.

The previous prime is 25281589. The next prime is 25281611. The reversal of 25281601 is 10618252.

It can be written as a sum of positive squares in 4 ways, for example, as 18931201 + 6350400 = 4351^2 + 2520^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 25281601 - 2¹⁷ = 25150529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25281611) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 426 + ... + 7123.

It is an arithmetic number, because the mean of its divisors is an integer number (3363525).

Almost surely, 2^25281601 is an apocalyptic number.

It is an amenable number.

25281601 is a deficient number, since it is larger than the sum of its proper divisors (1626599).

25281601 is a wasteful number, since it uses less digits than its factorization.

25281601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7763.

The product of its (nonzero) digits is 960, while the sum is 25.

The square root of 25281601 is about 5028.0812443715. The cubic root of 25281601 is about 293.4955523474.

Adding to 25281601 its reverse (10618252), we get a palindrome (35899853).

The spelling of 25281601 in words is "twenty-five million, two hundred eighty-one thousand, six hundred one".