25563137 has 2 divisors, whose sum is σ = 25563138. Its totient is φ = 25563136.

The previous prime is 25563079. The next prime is 25563149. The reversal of 25563137 is 73136552.

It is a Cunningham number, because it is equal to 5056²+1.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25563136 + 1 = 5056^2 + 1^2 .

It is a cyclic number.

It is not a de Polignac number, because 25563137 - 2¹⁰ = 25562113 is a prime.

It is not a weakly prime, because it can be changed into another prime (25560137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12781568 + 12781569.

It is an arithmetic number, because the mean of its divisors is an integer number (12781569).

Almost surely, 2^25563137 is an apocalyptic number.

It is an amenable number.

25563137 is a deficient number, since it is larger than the sum of its proper divisors (1).

25563137 is an equidigital number, since it uses as much as digits as its factorization.

25563137 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18900, while the sum is 32.

The square root of 25563137 is about 5056.0000988924. Note that the first 4 decimals coincide. The cubic root of 25563137 is about 294.5809889645.

Adding to 25563137 its reverse (73136552), we get a palindrome (98699689).

The spelling of 25563137 in words is "twenty-five million, five hundred sixty-three thousand, one hundred thirty-seven".