25001251309 has 2 divisors, whose sum is σ = 25001251310. Its totient is φ = 25001251308.

The previous prime is 25001251153. The next prime is 25001251313. The reversal of 25001251309 is 90315210052.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22304526409 + 2696724900 = 149347^2 + 51930^2 .

It is a cyclic number.

It is not a de Polignac number, because 25001251309 - 2¹⁷ = 25001120237 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25001251339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12500625654 + 12500625655.

It is an arithmetic number, because the mean of its divisors is an integer number (12500625655).

Almost surely, 2^25001251309 is an apocalyptic number.

It is an amenable number.

25001251309 is a deficient number, since it is larger than the sum of its proper divisors (1).

25001251309 is an equidigital number, since it uses as much as digits as its factorization.

25001251309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2700, while the sum is 28.

The spelling of 25001251309 in words is "twenty-five billion, one million, two hundred fifty-one thousand, three hundred nine".