25531000 has 96 divisors (see below), whose sum is σ = 65978640. Its totient is φ = 9240000.

The previous prime is 25530997. The next prime is 25531013. The reversal of 25531000 is 13552.

It is a super-2 number, since 2×25531000² = 1303663922000000, which contains 22 as substring.

It is a congruent 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 23 ways as a sum of consecutive naturals, for example, 120895 + ... + 121105.

Almost surely, 2^25531000 is an apocalyptic number.

25531000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25531000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32989320).

25531000 is an abundant number, since it is smaller than the sum of its proper divisors (40447640).

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

25531000 is a wasteful number, since it uses less digits than its factorization.

25531000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 254 (or 229 counting only the distinct ones).

The product of its (nonzero) digits is 150, while the sum is 16.

The square root of 25531000 is about 5052.8209942566. The cubic root of 25531000 is about 294.4574918733.

Adding to 25531000 its reverse (13552), we get a palindrome (25544552).

It can be divided in two parts, 2553 and 1000, that added together give a palindrome (3553).

The spelling of 25531000 in words is "twenty-five million, five hundred thirty-one thousand".