25953989 has 2 divisors, whose sum is σ = 25953990. Its totient is φ = 25953988.

The previous prime is 25953973. The next prime is 25953997. The reversal of 25953989 is 98935952.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19492225 + 6461764 = 4415^2 + 2542^2 .

It is a cyclic number.

It is not a de Polignac number, because 25953989 - 2⁴ = 25953973 is a prime.

It is a Sophie Germain 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 (25953919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12976994 + 12976995.

It is an arithmetic number, because the mean of its divisors is an integer number (12976995).

Almost surely, 2^25953989 is an apocalyptic number.

It is an amenable number.

25953989 is a deficient number, since it is larger than the sum of its proper divisors (1).

25953989 is an equidigital number, since it uses as much as digits as its factorization.

25953989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 874800, while the sum is 50.

The square root of 25953989 is about 5094.5057660189. The cubic root of 25953989 is about 296.0747505697.

The spelling of 25953989 in words is "twenty-five million, nine hundred fifty-three thousand, nine hundred eighty-nine".