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55111309 = 115010119
BaseRepresentation
bin1101001000111…
…0111010001101
310211200221111121
43102032322031
5103102030214
65245120541
71236303241
oct322167215
9124627447
1055111309
1129121a40
1216559151
13b557a56
147468421
154c89424
hex348ee8d

55111309 has 4 divisors (see below), whose sum is σ = 60121440. Its totient is φ = 50101180.

The previous prime is 55111291. The next prime is 55111321. The reversal of 55111309 is 90311155.

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 55111309 - 27 = 55111181 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 (55111349) 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, 2505049 + ... + 2505070.

It is an arithmetic number, because the mean of its divisors is an integer number (15030360).

Almost surely, 255111309 is an apocalyptic number.

It is an amenable number.

55111309 is a deficient number, since it is larger than the sum of its proper divisors (5010131).

55111309 is a wasteful number, since it uses less digits than its factorization.

55111309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5010130.

The product of its (nonzero) digits is 675, while the sum is 25.

The square root of 55111309 is about 7423.6991453049. The cubic root of 55111309 is about 380.5516203767.

The spelling of 55111309 in words is "fifty-five million, one hundred eleven thousand, three hundred nine".

Divisors: 1 11 5010119 55111309