25780831 has 2 divisors, whose sum is σ = 25780832. Its totient is φ = 25780830.

The previous prime is 25780829. The next prime is 25780847. The reversal of 25780831 is 13808752.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25780831 - 2¹ = 25780829 is a prime.

It is a super-2 number, since 2×25780831² = 1329302494101122, which contains 22 as substring.

Together with 25780829, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25780801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12890415 + 12890416.

It is an arithmetic number, because the mean of its divisors is an integer number (12890416).

Almost surely, 2^25780831 is an apocalyptic number.

25780831 is a deficient number, since it is larger than the sum of its proper divisors (1).

25780831 is an equidigital number, since it uses as much as digits as its factorization.

25780831 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13440, while the sum is 34.

The square root of 25780831 is about 5077.4827424621. The cubic root of 25780831 is about 295.4148372270.

The spelling of 25780831 in words is "twenty-five million, seven hundred eighty thousand, eight hundred thirty-one".