25249421 has 2 divisors, whose sum is σ = 25249422. Its totient is φ = 25249420.

The previous prime is 25249417. The next prime is 25249453. The reversal of 25249421 is 12494252.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13764100 + 11485321 = 3710^2 + 3389^2 .

It is a cyclic number.

It is not a de Polignac number, because 25249421 - 2² = 25249417 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25249121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12624710 + 12624711.

It is an arithmetic number, because the mean of its divisors is an integer number (12624711).

Almost surely, 2^25249421 is an apocalyptic number.

It is an amenable number.

25249421 is a deficient number, since it is larger than the sum of its proper divisors (1).

25249421 is an equidigital number, since it uses as much as digits as its factorization.

25249421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5760, while the sum is 29.

The square root of 25249421 is about 5024.8801975769. The cubic root of 25249421 is about 293.3709729879.

The spelling of 25249421 in words is "twenty-five million, two hundred forty-nine thousand, four hundred twenty-one".