25293991 has 2 divisors, whose sum is σ = 25293992. Its totient is φ = 25293990.

The previous prime is 25293979. The next prime is 25294013. The reversal of 25293991 is 19939252.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25293991 - 2⁹ = 25293479 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25293911) 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, 12646995 + 12646996.

It is an arithmetic number, because the mean of its divisors is an integer number (12646996).

Almost surely, 2^25293991 is an apocalyptic number.

25293991 is a deficient number, since it is larger than the sum of its proper divisors (1).

25293991 is an equidigital number, since it uses as much as digits as its factorization.

25293991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 43740, while the sum is 40.

The square root of 25293991 is about 5029.3131737843. The cubic root of 25293991 is about 293.5434899234.

The spelling of 25293991 in words is "twenty-five million, two hundred ninety-three thousand, nine hundred ninety-one".