25778461 has 2 divisors, whose sum is σ = 25778462. Its totient is φ = 25778460.

The previous prime is 25778449. The next prime is 25778491. The reversal of 25778461 is 16487752.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16892100 + 8886361 = 4110^2 + 2981^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25778461 is a prime.

It is a nialpdrome in base 12.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25778491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12889230 + 12889231.

It is an arithmetic number, because the mean of its divisors is an integer number (12889231).

Almost surely, 2^25778461 is an apocalyptic number.

It is an amenable number.

25778461 is a deficient number, since it is larger than the sum of its proper divisors (1).

25778461 is an equidigital number, since it uses as much as digits as its factorization.

25778461 is an evil number, because the sum of its binary digits is even.

The product of its digits is 94080, while the sum is 40.

The square root of 25778461 is about 5077.2493537348. The cubic root of 25778461 is about 295.4057845757.

The spelling of 25778461 in words is "twenty-five million, seven hundred seventy-eight thousand, four hundred sixty-one".