53317391 has 4 divisors (see below), whose sum is σ = 53361000. Its totient is φ = 53273784.

The previous prime is 53317387. The next prime is 53317409. The reversal of 53317391 is 19371335.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 53317391 - 2² = 53317387 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53317091) 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, 19916 + ... + 22433.

It is an arithmetic number, because the mean of its divisors is an integer number (13340250).

Almost surely, 2^53317391 is an apocalyptic number.

53317391 is a deficient number, since it is larger than the sum of its proper divisors (43609).

53317391 is a wasteful number, since it uses less digits than its factorization.

53317391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43608.

The product of its digits is 8505, while the sum is 32.

The square root of 53317391 is about 7301.8758548746. The cubic root of 53317391 is about 376.3769020396.

The spelling of 53317391 in words is "fifty-three million, three hundred seventeen thousand, three hundred ninety-one".