53507409 has 4 divisors (see below), whose sum is σ = 71343216. Its totient is φ = 35671604.

The previous prime is 53507393. The next prime is 53507413. The reversal of 53507409 is 90470535.

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.

It is a cyclic number.

It is not a de Polignac number, because 53507409 - 2⁴ = 53507393 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 53507409.

It is not an unprimeable number, because it can be changed into a prime (53502409) 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, 8917899 + ... + 8917904.

It is an arithmetic number, because the mean of its divisors is an integer number (17835804).

Almost surely, 2^53507409 is an apocalyptic number.

It is an amenable number.

53507409 is a deficient number, since it is larger than the sum of its proper divisors (17835807).

53507409 is a wasteful number, since it uses less digits than its factorization.

53507409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17835806.

The product of its (nonzero) digits is 18900, while the sum is 33.

The square root of 53507409 is about 7314.8758704437. The cubic root of 53507409 is about 376.8234954877.

The spelling of 53507409 in words is "fifty-three million, five hundred seven thousand, four hundred nine".