25831239851 has 2 divisors, whose sum is σ = 25831239852. Its totient is φ = 25831239850.

The previous prime is 25831239823. The next prime is 25831239869. The reversal of 25831239851 is 15893213852.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25831239851 - 2⁶ = 25831239787 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 25831239796 and 25831239805.

It is not a weakly prime, because it can be changed into another prime (25831239871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12915619925 + 12915619926.

It is an arithmetic number, because the mean of its divisors is an integer number (12915619926).

Almost surely, 2^25831239851 is an apocalyptic number.

25831239851 is a deficient number, since it is larger than the sum of its proper divisors (1).

25831239851 is an equidigital number, since it uses as much as digits as its factorization.

25831239851 is an evil number, because the sum of its binary digits is even.

The product of its digits is 518400, while the sum is 47.

The spelling of 25831239851 in words is "twenty-five billion, eight hundred thirty-one million, two hundred thirty-nine thousand, eight hundred fifty-one".