25121512 has 48 divisors (see below), whose sum is σ = 54054540. Its totient is φ = 10902528.

The previous prime is 25121507. The next prime is 25121513. The reversal of 25121512 is 21512152.

It can be written as a sum of positive squares in 6 ways, for example, as 14791716 + 10329796 = 3846^2 + 3214^2 .

It is a super-2 number, since 2×25121512² = 1262180730332288, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 25121512.

It is not an unprimeable number, because it can be changed into a prime (25121513) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 22438 + ... + 23530.

Almost surely, 2^25121512 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 25121512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27027270).

25121512 is an abundant number, since it is smaller than the sum of its proper divisors (28933028).

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

25121512 is a wasteful number, since it uses less digits than its factorization.

25121512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1142 (or 1125 counting only the distinct ones).

The product of its digits is 200, while the sum is 19.

The square root of 25121512 is about 5012.1364706081. The cubic root of 25121512 is about 292.8747460142.

Adding to 25121512 its reverse (21512152), we get a palindrome (46633664).

The spelling of 25121512 in words is "twenty-five million, one hundred twenty-one thousand, five hundred twelve".