825211813 has 4 divisors (see below), whose sum is σ = 835154208. Its totient is φ = 815269420.

The previous prime is 825211811. The next prime is 825211823. The reversal of 825211813 is 318112528.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 825211813 - 2¹ = 825211811 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (825211811) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4971073 + ... + 4971238.

It is an arithmetic number, because the mean of its divisors is an integer number (208788552).

Almost surely, 2^825211813 is an apocalyptic number.

825211813 is a gapful number since it is divisible by the number (83) formed by its first and last digit.

It is an amenable number.

825211813 is a deficient number, since it is larger than the sum of its proper divisors (9942395).

825211813 is an equidigital number, since it uses as much as digits as its factorization.

825211813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9942394.

The product of its digits is 3840, while the sum is 31.

The square root of 825211813 is about 28726.5001871095. The cubic root of 825211813 is about 937.9689862799.

The spelling of 825211813 in words is "eight hundred twenty-five million, two hundred eleven thousand, eight hundred thirteen".