25021949 has 2 divisors, whose sum is σ = 25021950. Its totient is φ = 25021948.

The previous prime is 25021903. The next prime is 25021951. The reversal of 25021949 is 94912052.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20313049 + 4708900 = 4507^2 + 2170^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25021949 is a prime.

Together with 25021951, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25021979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12510974 + 12510975.

It is an arithmetic number, because the mean of its divisors is an integer number (12510975).

Almost surely, 2^25021949 is an apocalyptic number.

It is an amenable number.

25021949 is a deficient number, since it is larger than the sum of its proper divisors (1).

25021949 is an equidigital number, since it uses as much as digits as its factorization.

25021949 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6480, while the sum is 32.

The square root of 25021949 is about 5002.1944184528. The cubic root of 25021949 is about 292.4873211442.

The spelling of 25021949 in words is "twenty-five million, twenty-one thousand, nine hundred forty-nine".