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55399 is a prime number
BaseRepresentation
bin1101100001100111
32210222211
431201213
53233044
61104251
7320341
oct154147
983884
1055399
1138693
1228087
131c2a6
1416291
1511634
hexd867

55399 has 2 divisors, whose sum is σ = 55400. Its totient is φ = 55398.

The previous prime is 55381. The next prime is 55411. The reversal of 55399 is 99355.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 55399 - 213 = 47207 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 55399.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27699 + 27700.

It is an arithmetic number, because the mean of its divisors is an integer number (27700).

255399 is an apocalyptic number.

55399 is a deficient number, since it is larger than the sum of its proper divisors (1).

55399 is an equidigital number, since it uses as much as digits as its factorization.

55399 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6075, while the sum is 31.

The square root of 55399 is about 235.3699216128. The cubic root of 55399 is about 38.1212654230.

Subtracting 55399 from its reverse (99355), we obtain a triangular number (43956 = T296).

It can be divided in two parts, 55 and 399, that multiplied together give a triangular number (21945 = T209).

The spelling of 55399 in words is "fifty-five thousand, three hundred ninety-nine".