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55531 = 77933
BaseRepresentation
bin1101100011101011
32211011201
431203223
53234111
61105031
7320620
oct154353
984151
1055531
11387a3
1228177
131c378
1416347
15116c1
hexd8eb

55531 has 4 divisors (see below), whose sum is σ = 63472. Its totient is φ = 47592.

The previous prime is 55529. The next prime is 55541. The reversal of 55531 is 13555.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13555 = 52711.

It is a cyclic number.

It is not a de Polignac number, because 55531 - 21 = 55529 is a prime.

It is a super-2 number, since 2×555312 = 6167383922, which contains 22 as substring.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 55499 and 55508.

It is not an unprimeable number, because it can be changed into a prime (55501) 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, 3960 + ... + 3973.

It is an arithmetic number, because the mean of its divisors is an integer number (15868).

255531 is an apocalyptic number.

55531 is a deficient number, since it is larger than the sum of its proper divisors (7941).

55531 is an equidigital number, since it uses as much as digits as its factorization.

55531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7940.

The product of its digits is 375, while the sum is 19.

The square root of 55531 is about 235.6501644387. The cubic root of 55531 is about 38.1515187711.

It can be divided in two parts, 555 and 31, that multiplied together give a triangular number (17205 = T185).

The spelling of 55531 in words is "fifty-five thousand, five hundred thirty-one".

Divisors: 1 7 7933 55531