25249999 has 2 divisors, whose sum is σ = 25250000. Its totient is φ = 25249998.

The previous prime is 25249979. The next prime is 25250003. The reversal of 25249999 is 99994252.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25249999 - 2⁷ = 25249871 is a prime.

25249999 is a modest number, since divided by 9999 gives 2524 as remainder.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25249909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12624999 + 12625000.

It is an arithmetic number, because the mean of its divisors is an integer number (12625000).

Almost surely, 2^25249999 is an apocalyptic number.

25249999 is a deficient number, since it is larger than the sum of its proper divisors (1).

25249999 is an equidigital number, since it uses as much as digits as its factorization.

25249999 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 524880, while the sum is 49.

The square root of 25249999 is about 5024.9377110567. The cubic root of 25249999 is about 293.3732115492.

The spelling of 25249999 in words is "twenty-five million, two hundred forty-nine thousand, nine hundred ninety-nine".