25623821 has 2 divisors, whose sum is σ = 25623822. Its totient is φ = 25623820.

The previous prime is 25623797. The next prime is 25623833. The reversal of 25623821 is 12832652.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23174596 + 2449225 = 4814^2 + 1565^2 .

It is a cyclic number.

It is not a de Polignac number, because 25623821 - 2⁶ = 25623757 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25620821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12811910 + 12811911.

It is an arithmetic number, because the mean of its divisors is an integer number (12811911).

Almost surely, 2^25623821 is an apocalyptic number.

It is an amenable number.

25623821 is a deficient number, since it is larger than the sum of its proper divisors (1).

25623821 is an equidigital number, since it uses as much as digits as its factorization.

25623821 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 25623821 is about 5061.9977281702. The cubic root of 25623821 is about 294.8139054212.

The spelling of 25623821 in words is "twenty-five million, six hundred twenty-three thousand, eight hundred twenty-one".