825641749 has 2 divisors, whose sum is σ = 825641750. Its totient is φ = 825641748.

The previous prime is 825641743. The next prime is 825641767. The reversal of 825641749 is 947146528.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 771839524 + 53802225 = 27782^2 + 7335^2 .

It is a cyclic number.

It is not a de Polignac number, because 825641749 - 2¹¹ = 825639701 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 825641699 and 825641708.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (825641743) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 412820874 + 412820875.

It is an arithmetic number, because the mean of its divisors is an integer number (412820875).

Almost surely, 2^825641749 is an apocalyptic number.

It is an amenable number.

825641749 is a deficient number, since it is larger than the sum of its proper divisors (1).

825641749 is an equidigital number, since it uses as much as digits as its factorization.

825641749 is an evil number, because the sum of its binary digits is even.

The product of its digits is 483840, while the sum is 46.

The square root of 825641749 is about 28733.9824771994. The cubic root of 825641749 is about 938.1318521906.

It can be divided in two parts, 8256 and 41749, that added together give a palindrome (50005).

The spelling of 825641749 in words is "eight hundred twenty-five million, six hundred forty-one thousand, seven hundred forty-nine".