55532309 has 8 divisors (see below), whose sum is σ = 63674688. Its totient is φ = 47442240.

The previous prime is 55532299. The next prime is 55532311. The reversal of 55532309 is 90323555.

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 55532309 - 2⁸ = 55532053 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55532359) 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, 10772 + ... + 15069.

It is an arithmetic number, because the mean of its divisors is an integer number (7959336).

Almost surely, 2^55532309 is an apocalyptic number.

It is an amenable number.

55532309 is a deficient number, since it is larger than the sum of its proper divisors (8142379).

55532309 is a wasteful number, since it uses less digits than its factorization.

55532309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26155.

The product of its (nonzero) digits is 20250, while the sum is 32.

The square root of 55532309 is about 7452.0003354804. Note that the first 3 decimals coincide. The cubic root of 55532309 is about 381.5181854330.

The spelling of 55532309 in words is "fifty-five million, five hundred thirty-two thousand, three hundred nine".