53131409 has 8 divisors (see below), whose sum is σ = 56480328. Its totient is φ = 49807360.

The previous prime is 53131363. The next prime is 53131423. The reversal of 53131409 is 90413135.

It can be written as a sum of positive squares in 4 ways, for example, as 23668225 + 29463184 = 4865^2 + 5428^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-53131409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (53131109) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1712 + ... + 10449.

It is an arithmetic number, because the mean of its divisors is an integer number (7060041).

Almost surely, 2^53131409 is an apocalyptic number.

It is an amenable number.

53131409 is a deficient number, since it is larger than the sum of its proper divisors (3348919).

53131409 is a wasteful number, since it uses less digits than its factorization.

53131409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12435.

The product of its (nonzero) digits is 1620, while the sum is 26.

The square root of 53131409 is about 7289.1295090703. The cubic root of 53131409 is about 375.9387655864.

The spelling of 53131409 in words is "fifty-three million, one hundred thirty-one thousand, four hundred nine".