25148581 has 2 divisors, whose sum is σ = 25148582. Its totient is φ = 25148580.

The previous prime is 25148579. The next prime is 25148587. The reversal of 25148581 is 18584152.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24453025 + 695556 = 4945^2 + 834^2 .

It is a cyclic number.

It is not a de Polignac number, because 25148581 - 2¹ = 25148579 is a prime.

It is a super-2 number, since 2×25148581² = 1264902252627122, which contains 22 as substring.

Together with 25148579, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25148587) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12574290 + 12574291.

It is an arithmetic number, because the mean of its divisors is an integer number (12574291).

Almost surely, 2^25148581 is an apocalyptic number.

It is an amenable number.

25148581 is a deficient number, since it is larger than the sum of its proper divisors (1).

25148581 is an equidigital number, since it uses as much as digits as its factorization.

25148581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12800, while the sum is 34.

The square root of 25148581 is about 5014.8360890462. The cubic root of 25148581 is about 292.9799013187.

The spelling of 25148581 in words is "twenty-five million, one hundred forty-eight thousand, five hundred eighty-one".