53312729 has 4 divisors (see below), whose sum is σ = 53327376. Its totient is φ = 53298084.

The previous prime is 53312717. The next prime is 53312773. The reversal of 53312729 is 92721335.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 53312729 - 2⁴ = 53312713 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 = 53312695 and 53312704.

It is not an unprimeable number, because it can be changed into a prime (53312929) 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, 2822 + ... + 10704.

It is an arithmetic number, because the mean of its divisors is an integer number (13331844).

Almost surely, 2^53312729 is an apocalyptic number.

It is an amenable number.

53312729 is a deficient number, since it is larger than the sum of its proper divisors (14647).

53312729 is an equidigital number, since it uses as much as digits as its factorization.

53312729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14646.

The product of its digits is 11340, while the sum is 32.

The square root of 53312729 is about 7301.5566148596. The cubic root of 53312729 is about 376.3659317587.

The spelling of 53312729 in words is "fifty-three million, three hundred twelve thousand, seven hundred twenty-nine".