25640141 has 8 divisors (see below), whose sum is σ = 25965720. Its totient is φ = 25316928.

The previous prime is 25640081. The next prime is 25640171. The reversal of 25640141 is 14104652.

It can be written as a sum of positive squares in 4 ways, for example, as 9278116 + 16362025 = 3046^2 + 4045^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 25640141 - 2¹⁴ = 25623757 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25640171) 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, 30515 + ... + 31343.

It is an arithmetic number, because the mean of its divisors is an integer number (3245715).

Almost surely, 2^25640141 is an apocalyptic number.

It is an amenable number.

25640141 is a deficient number, since it is larger than the sum of its proper divisors (325579).

25640141 is a wasteful number, since it uses less digits than its factorization.

25640141 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1183.

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 25640141 is about 5063.6094833626. The cubic root of 25640141 is about 294.8764818526.

Adding to 25640141 its reverse (14104652), we get a palindrome (39744793).

The spelling of 25640141 in words is "twenty-five million, six hundred forty thousand, one hundred forty-one".