25531242 has 64 divisors (see below), whose sum is σ = 59028480. Its totient is φ = 7347120.

The previous prime is 25531241. The next prime is 25531249. The reversal of 25531242 is 24213552.

Its product of digits (2400) is a multiple of the sum of its prime factors (200).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25531241) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 183609 + ... + 183747.

It is an arithmetic number, because the mean of its divisors is an integer number (922320).

Almost surely, 2^25531242 is an apocalyptic number.

25531242 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 25531242, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29514240).

25531242 is an abundant number, since it is smaller than the sum of its proper divisors (33497238).

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

25531242 is a wasteful number, since it uses less digits than its factorization.

25531242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200 (or 178 counting only the distinct ones).

The product of its digits is 2400, while the sum is 24.

The square root of 25531242 is about 5052.8449412188. The cubic root of 25531242 is about 294.4584222258.

Adding to 25531242 its reverse (24213552), we get a palindrome (49744794).

The spelling of 25531242 in words is "twenty-five million, five hundred thirty-one thousand, two hundred forty-two".