25211261 has 2 divisors, whose sum is σ = 25211262. Its totient is φ = 25211260.

The previous prime is 25211227. The next prime is 25211267. The reversal of 25211261 is 16211252.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14485636 + 10725625 = 3806^2 + 3275^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25211261 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25211267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12605630 + 12605631.

It is an arithmetic number, because the mean of its divisors is an integer number (12605631).

Almost surely, 2^25211261 is an apocalyptic number.

It is an amenable number.

25211261 is a deficient number, since it is larger than the sum of its proper divisors (1).

25211261 is an equidigital number, since it uses as much as digits as its factorization.

25211261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 240, while the sum is 20.

The square root of 25211261 is about 5021.0816563764. The cubic root of 25211261 is about 293.2231058238.

Subtracting from 25211261 its reverse (16211252), we obtain a palindrome (9000009).

It can be divided in two parts, 2521 and 1261, that multiplied together give a triangular number (3178981 = T₂₅₂₁).

The spelling of 25211261 in words is "twenty-five million, two hundred eleven thousand, two hundred sixty-one".