55331309 has 8 divisors (see below), whose sum is σ = 60419520. Its totient is φ = 50252800.

The previous prime is 55331303. The next prime is 55331327. The reversal of 55331309 is 90313355.

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

It is a cyclic number.

It is not a de Polignac number, because 55331309 - 2⁴ = 55331293 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55331303) 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, 14957 + ... + 18285.

It is an arithmetic number, because the mean of its divisors is an integer number (7552440).

Almost surely, 2^55331309 is an apocalyptic number.

It is an amenable number.

55331309 is a deficient number, since it is larger than the sum of its proper divisors (5088211).

55331309 is a wasteful number, since it uses less digits than its factorization.

55331309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4851.

The product of its (nonzero) digits is 6075, while the sum is 29.

The square root of 55331309 is about 7438.5017980774. The cubic root of 55331309 is about 381.0573254150.

The spelling of 55331309 in words is "fifty-five million, three hundred thirty-one thousand, three hundred nine".