825447919 has 2 divisors, whose sum is σ = 825447920. Its totient is φ = 825447918.

The previous prime is 825447901. The next prime is 825447929. The reversal of 825447919 is 919744528.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 825447919 - 2⁹ = 825447407 is a prime.

It is a super-2 number, since 2×825447919² = 1362728533962861122, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (825447929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 412723959 + 412723960.

It is an arithmetic number, because the mean of its divisors is an integer number (412723960).

Almost surely, 2^825447919 is an apocalyptic number.

825447919 is a deficient number, since it is larger than the sum of its proper divisors (1).

825447919 is an equidigital number, since it uses as much as digits as its factorization.

825447919 is an evil number, because the sum of its binary digits is even.

The product of its digits is 725760, while the sum is 49.

The square root of 825447919 is about 28730.6094435882. The cubic root of 825447919 is about 938.0584336130.

The spelling of 825447919 in words is "eight hundred twenty-five million, four hundred forty-seven thousand, nine hundred nineteen".