53020811 has 4 divisors (see below), whose sum is σ = 55811400. Its totient is φ = 50230224.

The previous prime is 53020801. The next prime is 53020823. The reversal of 53020811 is 11802035.

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

It is a de Polignac number, because none of the positive numbers 2^k-53020811 is a prime.

It is a super-2 number, since 2×53020811² = 5622412798195442, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (53020801) 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, 1395266 + ... + 1395303.

It is an arithmetic number, because the mean of its divisors is an integer number (13952850).

Almost surely, 2^53020811 is an apocalyptic number.

53020811 is a deficient number, since it is larger than the sum of its proper divisors (2790589).

53020811 is a wasteful number, since it uses less digits than its factorization.

53020811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2790588.

The product of its (nonzero) digits is 240, while the sum is 20.

The square root of 53020811 is about 7281.5390543483. The cubic root of 53020811 is about 375.6777338079.

Adding to 53020811 its reverse (11802035), we get a palindrome (64822846).

The spelling of 53020811 in words is "fifty-three million, twenty thousand, eight hundred eleven".