25434781 has 2 divisors, whose sum is σ = 25434782. Its totient is φ = 25434780.

The previous prime is 25434779. The next prime is 25434797. The reversal of 25434781 is 18743452.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23921881 + 1512900 = 4891^2 + 1230^2 .

It is a cyclic number.

It is not a de Polignac number, because 25434781 - 2¹ = 25434779 is a prime.

It is a super-2 number, since 2×25434781² = 1293856169035922, which contains 22 as substring.

Together with 25434779, it forms a pair of twin primes.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25434751) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12717390 + 12717391.

It is an arithmetic number, because the mean of its divisors is an integer number (12717391).

Almost surely, 2^25434781 is an apocalyptic number.

It is an amenable number.

25434781 is a deficient number, since it is larger than the sum of its proper divisors (1).

25434781 is an equidigital number, since it uses as much as digits as its factorization.

25434781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 26880, while the sum is 34.

The square root of 25434781 is about 5043.2906916021. The cubic root of 25434781 is about 294.0871176570.

The spelling of 25434781 in words is "twenty-five million, four hundred thirty-four thousand, seven hundred eighty-one".