25201530 has 56 divisors (see below), whose sum is σ = 68032692. Its totient is φ = 6718464.

The previous prime is 25201471. The next prime is 25201549. The reversal of 25201530 is 3510252.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 21316689 + 3884841 = 4617^2 + 1971^2 .

It is a super-2 number, since 2×25201530² = 1270234228681800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 5562 + ... + 9018.

Almost surely, 2^25201530 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25201530, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34016346).

25201530 is an abundant number, since it is smaller than the sum of its proper divisors (42831162).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25201530 is an equidigital number, since it uses as much as digits as its factorization.

25201530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3482 (or 3467 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 18.

The square root of 25201530 is about 5020.1125485391. The cubic root of 25201530 is about 293.1853750490.

Adding to 25201530 its reverse (3510252), we get a palindrome (28711782).

The spelling of 25201530 in words is "twenty-five million, two hundred one thousand, five hundred thirty".