812830541 has 4 divisors (see below), whose sum is σ = 834798972. Its totient is φ = 790862112.

The previous prime is 812830517. The next prime is 812830547. The reversal of 812830541 is 145038218.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 686178025 + 126652516 = 26195^2 + 11254^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-812830541 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 812830498 and 812830507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (812830547) 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, 10984160 + ... + 10984233.

It is an arithmetic number, because the mean of its divisors is an integer number (208699743).

Almost surely, 2^812830541 is an apocalyptic number.

It is an amenable number.

812830541 is a deficient number, since it is larger than the sum of its proper divisors (21968431).

812830541 is a wasteful number, since it uses less digits than its factorization.

812830541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21968430.

The product of its (nonzero) digits is 7680, while the sum is 32.

The square root of 812830541 is about 28510.1831106010. The cubic root of 812830541 is about 933.2543103021.

Adding to 812830541 its reverse (145038218), we get a palindrome (957868759).

The spelling of 812830541 in words is "eight hundred twelve million, eight hundred thirty thousand, five hundred forty-one".