25554691 has 2 divisors, whose sum is σ = 25554692. Its totient is φ = 25554690.

The previous prime is 25554673. The next prime is 25554701. The reversal of 25554691 is 19645552.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25554691 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25554691.

It is not a weakly prime, because it can be changed into another prime (25554631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12777345 + 12777346.

It is an arithmetic number, because the mean of its divisors is an integer number (12777346).

Almost surely, 2^25554691 is an apocalyptic number.

25554691 is a deficient number, since it is larger than the sum of its proper divisors (1).

25554691 is an equidigital number, since it uses as much as digits as its factorization.

25554691 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 54000, while the sum is 37.

The square root of 25554691 is about 5055.1647846534. The cubic root of 25554691 is about 294.5485424368.

It can be divided in two parts, 255 and 54691, that added together give a triangular number (54946 = T₃₃₁).

The spelling of 25554691 in words is "twenty-five million, five hundred fifty-four thousand, six hundred ninety-one".