55161309 has 12 divisors (see below), whose sum is σ = 85556544. Its totient is φ = 31520664.

The previous prime is 55161257. The next prime is 55161329. The reversal of 55161309 is 90316155.

It is not a de Polignac number, because 55161309 - 2¹² = 55157213 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55161329) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 187477 + ... + 187770.

It is an arithmetic number, because the mean of its divisors is an integer number (7129712).

Almost surely, 2^55161309 is an apocalyptic number.

It is an amenable number.

55161309 is a deficient number, since it is larger than the sum of its proper divisors (30395235).

55161309 is a wasteful number, since it uses less digits than its factorization.

55161309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 375264 (or 375257 counting only the distinct ones).

The product of its (nonzero) digits is 4050, while the sum is 30.

The square root of 55161309 is about 7427.0659752018. The cubic root of 55161309 is about 380.6666713525. Note that the first 4 decimals are identical.

The spelling of 55161309 in words is "fifty-five million, one hundred sixty-one thousand, three hundred nine".