25531212 has 96 divisors (see below), whose sum is σ = 75962880. Its totient is φ = 6497280.

The previous prime is 25531201. The next prime is 25531217. The reversal of 25531212 is 21213552.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (25531217) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 26662 + ... + 27602.

It is an arithmetic number, because the mean of its divisors is an integer number (791280).

Almost surely, 2^25531212 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25531212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37981440).

25531212 is an abundant number, since it is smaller than the sum of its proper divisors (50431668).

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

25531212 is a wasteful number, since it uses less digits than its factorization.

25531212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 991 (or 989 counting only the distinct ones).

The product of its digits is 600, while the sum is 21.

The square root of 25531212 is about 5052.8419725932. The cubic root of 25531212 is about 294.4583068932.

Adding to 25531212 its reverse (21213552), we get a palindrome (46744764).

The spelling of 25531212 in words is "twenty-five million, five hundred thirty-one thousand, two hundred twelve".