25562561 has 2 divisors, whose sum is σ = 25562562. Its totient is φ = 25562560.

The previous prime is 25562533. The next prime is 25562567. The reversal of 25562561 is 16526552.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24850225 + 712336 = 4985^2 + 844^2 .

It is a cyclic number.

It is not a de Polignac number, because 25562561 - 2¹⁸ = 25300417 is a prime.

It is not a weakly prime, because it can be changed into another prime (25562567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12781280 + 12781281.

It is an arithmetic number, because the mean of its divisors is an integer number (12781281).

Almost surely, 2^25562561 is an apocalyptic number.

It is an amenable number.

25562561 is a deficient number, since it is larger than the sum of its proper divisors (1).

25562561 is an equidigital number, since it uses as much as digits as its factorization.

25562561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18000, while the sum is 32.

The square root of 25562561 is about 5055.9431365473. The cubic root of 25562561 is about 294.5787764044.

The spelling of 25562561 in words is "twenty-five million, five hundred sixty-two thousand, five hundred sixty-one".