25911551 has 2 divisors, whose sum is σ = 25911552. Its totient is φ = 25911550.

The previous prime is 25911539. The next prime is 25911559. The reversal of 25911551 is 15511952.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25911551 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25911559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12955775 + 12955776.

It is an arithmetic number, because the mean of its divisors is an integer number (12955776).

Almost surely, 2^25911551 is an apocalyptic number.

25911551 is a deficient number, since it is larger than the sum of its proper divisors (1).

25911551 is an equidigital number, since it uses as much as digits as its factorization.

25911551 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2250, while the sum is 29.

The square root of 25911551 is about 5090.3389867473. The cubic root of 25911551 is about 295.9132895211.

It can be divided in two parts, 25911 and 551, that added together give a palindrome (26462).

The spelling of 25911551 in words is "twenty-five million, nine hundred eleven thousand, five hundred fifty-one".