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55257621 = 318419207
BaseRepresentation
bin1101001011001…
…0101000010101
310211222101012120
43102302220111
5103121220441
65252210153
71240452636
oct322625025
9124871176
1055257621
1129211961
1216609959
13b5a9523
1474a588d
154cb7966
hex34b2a15

55257621 has 4 divisors (see below), whose sum is σ = 73676832. Its totient is φ = 36838412.

The previous prime is 55257611. The next prime is 55257677. The reversal of 55257621 is 12675255.

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 55257621 - 25 = 55257589 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55257611) 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, 9209601 + ... + 9209606.

It is an arithmetic number, because the mean of its divisors is an integer number (18419208).

Almost surely, 255257621 is an apocalyptic number.

It is an amenable number.

55257621 is a deficient number, since it is larger than the sum of its proper divisors (18419211).

55257621 is a wasteful number, since it uses less digits than its factorization.

55257621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18419210.

The product of its digits is 21000, while the sum is 33.

The square root of 55257621 is about 7433.5469999187. The cubic root of 55257621 is about 380.8880913537. Note that the first 3 decimals are identical.

The spelling of 55257621 in words is "fifty-five million, two hundred fifty-seven thousand, six hundred twenty-one".

Divisors: 1 3 18419207 55257621