53815643 has 4 divisors (see below), whose sum is σ = 61503600. Its totient is φ = 46127688.

The previous prime is 53815631. The next prime is 53815651. The reversal of 53815643 is 34651835.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34651835 = 5 ⋅6930367.

It is a cyclic number.

It is not a de Polignac number, because 53815643 - 2¹⁰ = 53814619 is a prime.

It is a super-2 number, since 2×53815643² = 5792246863006898, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (53815243) 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, 3843968 + ... + 3843981.

It is an arithmetic number, because the mean of its divisors is an integer number (15375900).

Almost surely, 2^53815643 is an apocalyptic number.

53815643 is a deficient number, since it is larger than the sum of its proper divisors (7687957).

53815643 is an equidigital number, since it uses as much as digits as its factorization.

53815643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7687956.

The product of its digits is 43200, while the sum is 35.

The square root of 53815643 is about 7335.9145987395. The cubic root of 53815643 is about 377.5456851570.

The spelling of 53815643 in words is "fifty-three million, eight hundred fifteen thousand, six hundred forty-three".