25012501 has 16 divisors (see below), whose sum is σ = 26592048. Its totient is φ = 23500800.

The previous prime is 25012489. The next prime is 25012511. The reversal of 25012501 is 10521052.

It can be written as a sum of positive squares in 8 ways, for example, as 5880625 + 19131876 = 2425^2 + 4374^2 .

It is a cyclic number.

It is not a de Polignac number, because 25012501 - 2⁵ = 25012469 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25012511) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 182505 + ... + 182641.

It is an arithmetic number, because the mean of its divisors is an integer number (1662003).

Almost surely, 2^25012501 is an apocalyptic number.

25012501 is the 2501-st decagonal number.

It is an amenable number.

25012501 is a deficient number, since it is larger than the sum of its proper divisors (1579547).

25012501 is a wasteful number, since it uses less digits than its factorization.

25012501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 312.

The product of its (nonzero) digits is 100, while the sum is 16.

The square root of 25012501 is about 5001.2499437641. The cubic root of 25012501 is about 292.4505032276.

Adding to 25012501 its reverse (10521052), we get a palindrome (35533553).

The spelling of 25012501 in words is "twenty-five million, twelve thousand, five hundred one".