25949621 has 2 divisors, whose sum is σ = 25949622. Its totient is φ = 25949620.

The previous prime is 25949579. The next prime is 25949639. The reversal of 25949621 is 12694952.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15132100 + 10817521 = 3890^2 + 3289^2 .

It is a cyclic number.

It is not a de Polignac number, because 25949621 - 2¹⁸ = 25687477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25942621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12974810 + 12974811.

It is an arithmetic number, because the mean of its divisors is an integer number (12974811).

Almost surely, 2^25949621 is an apocalyptic number.

It is an amenable number.

25949621 is a deficient number, since it is larger than the sum of its proper divisors (1).

25949621 is an equidigital number, since it uses as much as digits as its factorization.

25949621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 38880, while the sum is 38.

The square root of 25949621 is about 5094.0770508503. The cubic root of 25949621 is about 296.0581400586.

The spelling of 25949621 in words is "twenty-five million, nine hundred forty-nine thousand, six hundred twenty-one".