53312309 has 4 divisors (see below), whose sum is σ = 56118240. Its totient is φ = 50506380.

The previous prime is 53312297. The next prime is 53312339. The reversal of 53312309 is 90321335.

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 53312309 - 2⁴ = 53312293 is a prime.

It is a super-2 number, since 2×53312309² = 5684404581822962, 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 (53312339) 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, 1402937 + ... + 1402974.

It is an arithmetic number, because the mean of its divisors is an integer number (14029560).

Almost surely, 2^53312309 is an apocalyptic number.

It is an amenable number.

53312309 is a deficient number, since it is larger than the sum of its proper divisors (2805931).

53312309 is a wasteful number, since it uses less digits than its factorization.

53312309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2805930.

The product of its (nonzero) digits is 2430, while the sum is 26.

The square root of 53312309 is about 7301.5278538125. The cubic root of 53312309 is about 376.3649434138.

The spelling of 53312309 in words is "fifty-three million, three hundred twelve thousand, three hundred nine".