811220541 has 16 divisors (see below), whose sum is σ = 1091489280. Its totient is φ = 535898160.

The previous prime is 811220521. The next prime is 811220591. The reversal of 811220541 is 145022118.

It is not a de Polignac number, because 811220541 - 2⁶ = 811220477 is a prime.

It is a super-2 number, since 2×811220541² = 1316157532280665362, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (811220521) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 261586 + ... + 264668.

It is an arithmetic number, because the mean of its divisors is an integer number (68218080).

Almost surely, 2^811220541 is an apocalyptic number.

It is an amenable number.

811220541 is a deficient number, since it is larger than the sum of its proper divisors (280268739).

811220541 is a wasteful number, since it uses less digits than its factorization.

811220541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3856.

The product of its (nonzero) digits is 640, while the sum is 24.

The square root of 811220541 is about 28481.9335895581. The cubic root of 811220541 is about 932.6377272631.

Adding to 811220541 its reverse (145022118), we get a palindrome (956242659).

The spelling of 811220541 in words is "eight hundred eleven million, two hundred twenty thousand, five hundred forty-one".