25497421 has 2 divisors, whose sum is σ = 25497422. Its totient is φ = 25497420.

The previous prime is 25497419. The next prime is 25497427. The reversal of 25497421 is 12479452.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12859396 + 12638025 = 3586^2 + 3555^2 .

It is a cyclic number.

It is not a de Polignac number, because 25497421 - 2¹ = 25497419 is a prime.

Together with 25497419, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25497427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12748710 + 12748711.

It is an arithmetic number, because the mean of its divisors is an integer number (12748711).

Almost surely, 2^25497421 is an apocalyptic number.

It is an amenable number.

25497421 is a deficient number, since it is larger than the sum of its proper divisors (1).

25497421 is an equidigital number, since it uses as much as digits as its factorization.

25497421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20160, while the sum is 34.

The square root of 25497421 is about 5049.4971036728. The cubic root of 25497421 is about 294.3283426549.

The spelling of 25497421 in words is "twenty-five million, four hundred ninety-seven thousand, four hundred twenty-one".