25858813 has 2 divisors, whose sum is σ = 25858814. Its totient is φ = 25858812.

The previous prime is 25858799. The next prime is 25858817. The reversal of 25858813 is 31885852.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21930489 + 3928324 = 4683^2 + 1982^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25858813 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25858817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12929406 + 12929407.

It is an arithmetic number, because the mean of its divisors is an integer number (12929407).

Almost surely, 2^25858813 is an apocalyptic number.

It is an amenable number.

25858813 is a deficient number, since it is larger than the sum of its proper divisors (1).

25858813 is an equidigital number, since it uses as much as digits as its factorization.

25858813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 76800, while the sum is 40.

The square root of 25858813 is about 5085.1561431287. The cubic root of 25858813 is about 295.7123948874.

The spelling of 25858813 in words is "twenty-five million, eight hundred fifty-eight thousand, eight hundred thirteen".