25125813 has 24 divisors (see below), whose sum is σ = 38846808. Its totient is φ = 15593472.

The previous prime is 25125811. The next prime is 25125823. The reversal of 25125813 is 31852152.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 4848804 + 20277009 = 2202^2 + 4503^2 .

It is not a de Polignac number, because 25125813 - 2¹ = 25125811 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25125811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13995 + ... + 15687.

It is an arithmetic number, because the mean of its divisors is an integer number (1618617).

Almost surely, 2^25125813 is an apocalyptic number.

It is an amenable number.

25125813 is a deficient number, since it is larger than the sum of its proper divisors (13720995).

25125813 is a wasteful number, since it uses less digits than its factorization.

25125813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1813 (or 1810 counting only the distinct ones).

The product of its digits is 2400, while the sum is 27.

The square root of 25125813 is about 5012.5655107938. The cubic root of 25125813 is about 292.8914592121.

Adding to 25125813 its reverse (31852152), we get a palindrome (56977965).

The spelling of 25125813 in words is "twenty-five million, one hundred twenty-five thousand, eight hundred thirteen".