53112509 has 4 divisors (see below), whose sum is σ = 53518080. Its totient is φ = 52706940.

The previous prime is 53112481. The next prime is 53112511. The reversal of 53112509 is 90521135.

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 an emirpimes, since its reverse is a distinct semiprime: 90521135 = 5 ⋅18104227.

It is a cyclic number.

It is not a de Polignac number, because 53112509 - 2²⁴ = 36335293 is a prime.

It is a super-2 number, since 2×53112509² = 5641877224550162, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53112529) 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, 202589 + ... + 202850.

It is an arithmetic number, because the mean of its divisors is an integer number (13379520).

Almost surely, 2^53112509 is an apocalyptic number.

It is an amenable number.

53112509 is a deficient number, since it is larger than the sum of its proper divisors (405571).

53112509 is a wasteful number, since it uses less digits than its factorization.

53112509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 405570.

The product of its (nonzero) digits is 1350, while the sum is 26.

The square root of 53112509 is about 7287.8329426517. The cubic root of 53112509 is about 375.8941837626.

The spelling of 53112509 in words is "fifty-three million, one hundred twelve thousand, five hundred nine".