25085861 has 2 divisors, whose sum is σ = 25085862. Its totient is φ = 25085860.

The previous prime is 25085831. The next prime is 25085867. The reversal of 25085861 is 16858052.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24900100 + 185761 = 4990^2 + 431^2 .

It is a cyclic number.

It is not a de Polignac number, because 25085861 - 2²² = 20891557 is a prime.

It is a super-2 number, since 2×25085861² = 1258600844222642, which contains 22 as substring.

It is equal to p_1570985 and since 25085861 and 1570985 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25085867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12542930 + 12542931.

It is an arithmetic number, because the mean of its divisors is an integer number (12542931).

Almost surely, 2^25085861 is an apocalyptic number.

It is an amenable number.

25085861 is a deficient number, since it is larger than the sum of its proper divisors (1).

25085861 is an equidigital number, since it uses as much as digits as its factorization.

25085861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19200, while the sum is 35.

The square root of 25085861 is about 5008.5787405211. The cubic root of 25085861 is about 292.7361367791.

The spelling of 25085861 in words is "twenty-five million, eighty-five thousand, eight hundred sixty-one".