825778069 has 2 divisors, whose sum is σ = 825778070. Its totient is φ = 825778068.

The previous prime is 825778033. The next prime is 825778091. The reversal of 825778069 is 960877528.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 442597444 + 383180625 = 21038^2 + 19575^2 .

It is a cyclic number.

It is not a de Polignac number, because 825778069 - 2¹³ = 825769877 is a prime.

It is a super-2 number, since 2×825778069² = 1363818838482737522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (825778669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 412889034 + 412889035.

It is an arithmetic number, because the mean of its divisors is an integer number (412889035).

Almost surely, 2^825778069 is an apocalyptic number.

It is an amenable number.

825778069 is a deficient number, since it is larger than the sum of its proper divisors (1).

825778069 is an equidigital number, since it uses as much as digits as its factorization.

825778069 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1693440, while the sum is 52.

The square root of 825778069 is about 28736.3544834762. The cubic root of 825778069 is about 938.1834803520.

The spelling of 825778069 in words is "eight hundred twenty-five million, seven hundred seventy-eight thousand, sixty-nine".