25001251249 has 4 divisors (see below), whose sum is σ = 26924424436. Its totient is φ = 23078078064.

The previous prime is 25001251153. The next prime is 25001251309. The reversal of 25001251249 is 94215210052.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8017948849 + 16983302400 = 89543^2 + 130320^2 .

It is a cyclic number.

It is not a de Polignac number, because 25001251249 - 2⁹ = 25001250737 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25001251249.

It is not an unprimeable number, because it can be changed into a prime (25001221249) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 961586574 + ... + 961586599.

It is an arithmetic number, because the mean of its divisors is an integer number (6731106109).

Almost surely, 2^25001251249 is an apocalyptic number.

It is an amenable number.

25001251249 is a deficient number, since it is larger than the sum of its proper divisors (1923173187).

25001251249 is a wasteful number, since it uses less digits than its factorization.

25001251249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1923173186.

The product of its (nonzero) digits is 7200, while the sum is 31.

The spelling of 25001251249 in words is "twenty-five billion, one million, two hundred fifty-one thousand, two hundred forty-nine".